Doubt we will have a launch soon. Reason being
A: GloFo is advertising 14nm FinFet availability for Q3 for other customers. Either, AMD is getting every bloody wafer out of GloFo, or the process isn't right yet.
B: AMD launched\rebadged a bunch of 28nm parts. This points to having to service GloFo guaranteed wafer buys if 14nm isn't working
C: AMD signed for wafers from Samsung. Either they are expecting a surge in buying (possible I guess, I'm much more enthused about AMD new architecture than Nvidia's maxwell refresh), or the fact is that GloFo can't deliver on 14nm.
We've seen Polaris 11 chips demoed a while back. My theory on GloFo advertising Q3 for customers is because they are making AMD's wafers. Keep in mind the owners of GloFo have a 10% stake in AMD, and AMD has priority. Also AMD has announced Apple design win for P11 in Q1, and is likely producing Polaris 11 chips for them for the upcoming Apple Mac refreshes (which are long overdue).
A schedule like that is set well in advance, and Lisa Su wouldn't be lying to the investors this close to when the products are supposed to launch, if GloFo schedule made it impossible to accomplish.
Rebaging of lower models happens with every generation. It has no meaning.
Securing a second source from Samsung I think has another purpose entirely, but I would rather not speculate on it.