Nothing official of course but from what I've heard...
Eurex is ready to go the week after gaining approval. They certainly hope that will be "any time now". There is some pressure on the CFTC to move quickly as some firms have allegedly expressed an interest in using Eurex for the June rollover. March rollover starts in Feb, and Eurex missing the bulk of the June contracts would be less than ideal.
I believe I read somewhere that IB will embrace Eurex electronic products. Given both the IB and Eurex commitment to electronic trading for the masses, it seems like a great match.