For what it's worth the questions can't really be answered by a simple FAQ, because history has shown that those answers aren't worth the page they're written on. Many companies that get bought talk all about the fact that nothing is going to change.

Something is always going to change, almost always in a way that impacts customers. In the best case it's something simple like a different name on the bill, other times it will leave customers scrambling for an alternative before a ridiculous deadline. It could happen within weeks, after a month, or it might take a year. The answers at the time of the announcement are the same regardless.