I guess you mean Troy (the english title is this one..). It's true that the game doesn't need more assassins, and personally I think that (as chukblok said) to balance things out they should add one more heavy for every faction. Still, probably the next two heroes they'll add will be a hybrid and an assassin for the chinese faction.
Also, I have no idea what this hero would look like, but if he has hidden blades, he surely will be a light spammer. And people don't like light spammers. Actually, they could make him an assassin-hybrid who also uses a rapier or something similar, and he would finally be that "musketeer-hero" people always ask for. But anyway, the next heroes will almost surely be 2 chinese heroes and then a heavy one for each faction. So, It could be, but not anytime soon.