If they made it straight VIT they would have to go back and get rid of all the STR on tanking gear, and they won't do that. Because that means bloating it with VIT and that would mean devaluing current VIT numbers, etc etc, huge mess.

I do hope it's 60/40 or something like that to at least make VIT more attractive point-for-point. Now if only they'd do something interesting with Parry while they're at it...