I thought Mastercoin already has AE going ?
Completely anecdotal (this is the internet, after all), but a colleague of mine met the mastercoin guys recently in Berlin and said they have all but officially thrown in the towel.
Again, hearsay... but this leaves a big opportunity for players like Nxt, etherium, NEM etc.
I have a chub for Ethereum, they are pre-marketing it so well.