Fedora 14
Virtualization
Virtual2Virtual migration scripts helps with transition from Xen to KVM. I don't like it, but I expected it and if I have to do such transition in future, at least I hope it'll be easy. Xen Dom0 support is missing from a stock Fedora kernel.
SPICE
A new rendering protocol for remote desktops, much improved compared to RDP and VNC. An interesting feature is placing the graphic processing either on the client (which reduces network and server load) or on the server (for thin clients with insufficient CPU power). According to Redhat, it's even possible to watch full HD video on remote desktop. You can also use USB devices plugged to a terminal - a feature long available in commercial, Windows-based solutions, but missing in a Linux world. For more:
http://www.redhat.com/virtualization/rhev/desktop/spice/
Libjpeg-turbo
It might seem like a small change, but if you tried it and if you work with digital images, you know better. I've used it for a few monhts and it gives a massive speedup for Gimp and other photo-related software.
D compiler
In the last few years we've seen a wave of new programming languages. Most of them run on JVM, CLR (.NET) or other such platform. D is one the very few that can be compiled to machine code and yet has all the features that programmers learned to love in new languages. I've never tried D, not being much of a software developer myself, but I like the idea of having a better language for system programming than a 40 year old C. Fedora 13 features a GNU D compiler as a part of a GCC collection, Debian Squeeze has it too.
Perl 6
Perl is in transition to a new, greatly redesigned version. Again, I'm not going to use it myself (I used to write my sysadmin scripts in Perl, than moved to Python) but the developers will get a better, cleaner tool which means more great free software for me.
Fedora 15
Libre Office
A branch of OpenOffice that appeared after Oracle's acquisition of Sun. Probably all distro will switch to Libre Office in 2011.
Systemd
An init replacement, alternative to Upstart used in Ubuntu and other distros (including Fedora 14). You can find more information and a comparison of these two systems in this insightful, but very long post by a Systemd developer. I also have some experience with Solaris SMF and I found it superior to Upstart, although confusing and overly complicated (due to XML configuration and reinventing the names for pretty much everything). Systemd started later than any of these and learned on their mistakes, so it'll likely be the Best Init System Ever. Granted, most people don't care much about that, they just want there daemons started. But believe me, it's the big thing if you need to dive into the guts of your system.
No SUID
No binaries will be setuid root on Fedora 15. This will make the system more resillient against yet unknown security holes.
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