Overall it is gearing up to be a pretty radical and exciting release; there are some changes to the default application set as well as some major version upgrades of existing core components. We are trying to be fairly aggressive in terms of new stuff so that if Canonical wants Karmic+1 to be an LTS (Long Term Support) release, we can have fairly stabilized new technologies by then (thanks to 6 months of stabilization in the Karmic cycle) instead of having to wait until after the LTS (Karmic+2) to introduce them. Since many of these changes would be too radical to first appear in an LTS, if we don't upgrade now we may not be able to for a year, and have to maintain old versions for 3-5 years in the LTS.
On the messaging front, Ekiga will be dropped from the CD to save 10 megs, and Empathy will likely replace Pidgin due to a responsive upstream, voice/video support, and better GNOME integration. It also now has the ability to import accounts from Pidgin, so this should help out with migration. I checked it out a bit at UDS and was impressed with how useful it is with absolutely zero configuration. It will pull your name from the system and enable avahi (auto-discovery of people nearby, like bonjour) with no set up, which made it quite easy to get in contact with people at the conference. You can also supply your email and Jabber ID to the avahi interface to allow other people to discover that info as well.
It also sounds likely that Banshee will replace Rhythmbox as the default media player, and it is the official default of UNR (Ubuntu Netbook Remix) Karmic. This will bring a snazzier interface, better device support including iPods and Androids, and quite importantly an active and responsive upstream. I will admit to not being a huge fan of this transition for Karmic as it seemed too early for me (the lack of a folder watch is quite a regression for me, and it has been promised for the last 3 releases or so, so I'm not holding my breath), but after checking out 1.5 for a bit I will admit that it is growing on me. The user interface does seem nicer, and the lightweight video library which keeps track of what you haven't watched is nice. However, it does seem to use 3-10x more memory than RB which is very troubling (60-300MB compared to RBs fairly consistent 25MB), especially on the netbook scene. I've also had issues with it skipping occasionally, which is very unfortunate. Hopefully the UNR switch will put pressure on better memory management for Banshee.
Banshee syncing with an Android G1Empathy and Banshee will probably replace their predecessors around alpha 2 of Karmic, and will be either left as default or reverted based on reported regressions and bugs. Keep in mind that if you end up not preferring these applications, the other ones still exist and you can continue to use them.
There are also going to be a bunch of underlying speed improvements, with the boot speed goal being 10-12 seconds. When Ubuntu talks about boot times, we are referring to the time from when grub starts (when Linux first gets control of the machine) to when the user is at a fully loaded desktop with no I/O. The main test machines being used by Canonical here are Dell Mini 9s, with auto-login enabled to get a consistent log-in time. This is pretty impressive as the boot goal was 25 seconds in Jaunty, which was met, and was aggressive itself as Intrepid booted in about 65 seconds on the Dell Mini 9.
grub2 is likely to be default for new installations (upgrades will have grub1 chainloaded to grub2), with ext4 as the default filesystem. The boot process will also be streamlined, with the grub timeout set to 0 and the boot menu hidden. There will instead be two new ways to boot into a different system now. First, there will be a key that can be pressed while booting to bring up an OS chooser, which will halt the current boot and restart into the chosen one. Another goal is to have the restart menu item in GNOME aware of installed OSes and allow the choice there, so you could select for example "Restart into OSX". All in all this means no racing to select the OS for dual-booters, and a faster boot process as well. /tmp is also hopefully going to be made a tmpfs, which means it will reside in RAM and overflow to a swapfile (which in recent Linuxes have on par performance with swap partitions). This means power savings, less disk I/O (especially great for SSDs), and of course blazingly fast performance which should help out a lot especially when, say, loading files from inside an archive The Gnome Display Manager (GDM, which handles the login screen) will also likely be upgraded to GDM2.
Finally let me fire off a few more changes. Power management is being improved all around, with one change already landed being that audio cards will be automatically powered down after 10 seconds of no sound. Encrypted Home directories will hopefully be easier to set up now with an option right in the graphical installer, and I'm working on a UI for managing this and encrypted Private directories in Karmic, more on that later. Firefox 3.5 should be the default version of Firefox. For notifications which want to display actions if the user is interested, there is work on morphing windows:
Ubuntu is also working on being social from the start (see desktop-karmic-social-from-the-start on gobby.ubuntu.com), perhaps installing Gwibber by default and asking the user if they want to integrate social sites (twitter, facebook) into the desktop when they visit them in Firefox, via an extension. There has also been work in looking for a better scanning application to replace xsane (perhaps GnomeScan), some look into using Gnome Control Center, and a common printing dialog.
Okay phew, that's what I've got to report! Let me know what you think of these decisions and changes, and if there is anything you were hoping for that didn't make it, or really anything else you've got to say!
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