Yep. It's a TM engine (the best dirtbike engines in the world if you ask me). 60-65hp is really possibl. In a french mag, they did a giant shootout between 125mx dirtbikes, most "usual" (yammi, honda, suzuki-kawi and ktm) bikes wer rated between 32 and 34 rwhp. The TM reached 39. I think it says everything about the ability these guys have when it comes to getting the max from an engine.
And the quad itself is actually a Gas Gas. I think the guy who deisgned it is the same than for the Gas Gas.
I can't wait to see it for real.