Well, this is what I can remember from what has been told to us:

There will be a DAPI, or a Distributed Applications Programming Layer which will allow developers to develop applications on top of Dash Core.
Every transaction will be an instantX transaction, where miners will no longer make the decision on what to include in the blockchain, but masternode quorums will.
And somehow mixing is supposed to be instant.

I think the first thing that will come out is the DAPI

Everything else is elaboration on the talk Evan gave at Bicoin Wednesday and rampant speculation, which is always fun, but I'm afraid I've done enough of that, and I'll bore everyone again if I go on, LOL.