Razorclaw Shifter Avengers

The first two pages of the Avenger from the PHB2 were on show at the New York Comic Con. In it, we see an unfortunately vague reference to shifters:

"...razorclaw shifters make excellent pursuing avengers..."

So, this could mean that there will still be different stat blocks for the different shifter traits as we see in the MM. However, it could also just be referring to the trait, like saying 'earthsoul genasi', for example. It's all very vague, and really there isn't much difference between the two approaches. It's just presentation, really.
Either way, it does mean that the different shifters still have different ability bonuses, otherwise it'd just say 'shifter'.