I don't want hundreds of new contacts automatically added to my phone.
That seems to be exactly what it does, it's really annoying. In the contact app, you can uncheck Facebook contacts, and it will show the contacts that are on your phone, but when typing in an email address for example, every one of your facebook contacts show up in the quick fill. Lets be honest, most of us have little to no desire to email or call 95% of our Facebook "friends". I really hope they fix this before the GM.