@jventura: I upgraded from the previous version and now my gmail account dissapeared and when I tried to add a new contact it asked me to add a new Exchange account. I'm trying to add my gmail account there but it can't connect to the server... Then I added it as an email account (in System Settings > Accounts & synchronization) but I still don't get any email notifications... Gmail app (which I was using until the update) shuts as I open it, but Mail app seems to work well.
Can anyone confirm this behavior? I may just need to do some wipes, because I installed the update without wiping anything.
Edit: I have just noticed that Google Play doesn't work either. Which wipes should I perform?
Strange, I installed over the previous version and didn't had any troubles.. Maybe you forgot to reinstall the gapps again!
If you can't fix only with the gapps package, you should do a full wipe, format /system, and reinstall everything from scratch..