Ethereum will have 12 second block times with PoW out of the box using something called GHOST which enables miners to mine uncle blocks (orphan blocks that still pay rewards).
We shouldn't expect bitassets on ethereum any time soon since a weakness in the schellingcoin system of getting price feeds was discovered. I'm thinking that CFS could could put our bonds on ethereum and add them to etherex, so they'll have fiat tracking instruments that are ultimately backed by bitshares at launch (but with counterparty risk from cryptohedge).