One thing that troubles me about the new partitioning GUI is that it does not tell you what will be formatted and what won't.
I think there *IS* a bit of explanation available with it but you have to actually read it... which I had to wise up to... because I was so used to the previous that I had been on auto-pilot for many releases now.
The interface was either done mostly by or co-ordinated by Marin(sp?) Duffy and she blogged about it several times... but I know I didn't read all of that nor give any feedback because I knew it was going to take a lot of effort... and I just didn't want to dedicate the time... not that I'm that active in Fedora... nor do I have any pull... but I saw it coming.
I've been remixing F18 and have installed it now about 30 times in various scenarios and the new installer is growing on me... and there are some areas it does remarkably well on and others where I didn't get a bootable system when it was over with. I'm glad to see they keep delaying it and delaying it... because yes, there is a ton of awesome stuff coming with it... so it would be horrible if pesky installer issues ruined it.