Update-1 might have been a quick update just to stop all the complaining from people on where the update was. Following updates might fix the multiple home screens and other add-on that aren't in this update. The phone still might have issues with those applications and further updates will be needed to correct and fix them. Just a guess.
I'm catching up to threads, in case this wasn't addressed.
2.1 original code was 2.1-r1.
2.1 updated code was 2.1-r2, aka 2.1 update-1.
Its just a newer version fo 2.1.