To hide the new icons, use a launcher that will let you hide them. LauncherPro has this feature, as does 360 Launcher. Not sure who else.
Now where's my $1 million? Haha.
Facebook 1.9 is okay... there are some UI tweaks around the app, nothing major though. Commenting on an image seemed a little more straightforward, and the comment box looked different.
If you want an ICS-themed Facebook app, look up Fast Facebook. It was just featured on Lifehacker yesterday, but I got it a week or two ago here on XDA. Should be able to find it in this very (sub)forum. I don't care for the UI but it is faster.