I hope to see Pinta in Maverick as a replacement for GIMP, less powerful but friendier, GIMP will still be available and remains a stunning example of what is possible with Open Source.
Banshee as the default media player, it has now addressed the complains from the Jaunty cycle and has made huge strides since. Additionally the project adopted the GNOME release cycle which aligns well for Ubuntu.
BtrFS support, it is the first release after an LTS we can begin major adventures. There are safe ways of ensuring the user understands that it is a technology preview.
The notification area disappearing, I will be highly interested in what will happen and what challenges we will met.
Proper integration of web applications such as GMail, so that the user is presented with notifications for new mails. mailto: links work, contacts and chat is setup. Options to use Google Docs added for approriate files.
Tracker and Zeitgeist deployed. The reason why Tracker hasn't catched on is that applications haven't used it. This is changing and with FSter we have a compelling demo in the form of properly updated and presented in a desirable (but configurable) fashion. This can piggybag on the existing gtkbookmarks interaction as well as the xdg_user_dir drives. An easy demo that would show where Tracker can take the desktop. Videos from various cool uses are practically overflowing. I think we can convince the user that it is worth investing in now.
Download-as-a-Service. I am tired of how poorly downloads are handled. They should be handled by a kit of some sort now. MonoTorrent is already dbus capable as I understand. Could it be prototyped in the Maverick timeframe. Perhaps, it sounds like a nice and unique feature that would set Ubuntu and the rest of Linux look innovative and impressive.
Newest Mono stack and applications. We are in store for good things. An LLVM backend, new garbage collector. Massive improvements across the board. Looking forward to this, just like the usual software rev, new kernels, drivers.
Nouveau 3D support. It's already really good for a number of users. It would be in the spirit of Maverick to enable it to test it wider. Many users will still switch to the binary driver but it is still a strong showing of the power of out of the box of Ubuntu that all those pretty things work before they are reminded of Windows and driver cds. We could make the binary driver a recommended update with a little explanatory dialog.
Tasque in the default install, we miss a good todo list, but it definitely needs better integration. Usability studies would be valuable here to avoid obvious badness.
A MeeGo spin for the netbook deployments, hopes for eventual business to be had on mobile and other devices MeeGo targets. Possible future business to be had and people to bring awesome to.
Webcam support in MSN using telepathy, I don't need VoIP but I do need the webcam working. aMSN does this currently and while the app itself has a tendency towards 100% CPU usage while using the feature, it does have working webcam only mode. Just that would be great, I know reverse engineering the new p2p protocol for full VoIP will take time and effort. Not your bad, those proprietary protocols make the unfortunately highly requested hard.