Okay, I install Fedora Core 4 test 1now the following are my findings.
It installed nicely, aside some odd switching back and forth between cds something I've never seen with Fedora before - for the first time in my life I've used cd 4.
Okay the bad news, when it first booted, firstboot didn't start because of python issues - so only the root account was present, sadly do to something I'm tempted to attribute to SELinux it didn't save the password I gave it during the anaconda installer. So a reboot with SELinux=0 later and some yum magic to update a few packages I had X and SELinux back.
As usual with the Development branch of Fedora packages don't always install because of conflicts, this happened today as well - so selective updates to avoid the problem library were the only way around the problem - I expect this will be fixed tomorrow.
I selected Danish in the installer, yet LANG=da_DK.UTF-8 wasn't set, and the provided tool fails to set it correctly - very disappointing since Fedora always supported languages well. The config files look okay so where the problem lies I don't know.
Otherwise programs start the same as always, OpenOffice2 is present but the icons and theme stuff hasn't been enabled yet so it doesn't look as nice as it did in OOo1 (or Hoary's OOo2 for that matter).
The desktop theme is bluecurve as always, meaning I'll have to live without clearlooks which was present in Hoary and I like very much - personal preference
Sadly the up2date/rhn-applet replacement pup wasn't ready for the FC4t1 release, I hope it will be ready soon because I like visual confirmation that I have updates waiting - I for one liked the throbbing red icon in the tray in the previous releases, it was noticable.
So what's new:
GCC4 meaning we now have some cool free stuff like Java, and there's a new protective meassure in glibc/gcc generally known as fortification - I'm a big fan of security so more is always welcome and Fedora has always rolled out security by default, like exec-shield, SELinux, a default firewall and now this added protection.
GNOME 2.10, we all know this rocks.. so no need to go into detail here. (I believe KDE 3.4 is also present, but I'm relatively indifferent to KDE so I haven't installed it)
OOo2, again no introduction needed - it still needs polish though.
Fedora Extras, it should be enabled by default now, but I haven't had time to play with it.
Xen, this looks like fun, but I don't personally have a use for it yet - Rik van Riel is doing some hard work beating it into shape I think.
Overall I think, despite these gross issues, that FC4 is looking good, and by all means if you have the time and skills needed, please install it somewhere and start posting bugs.