Well, Mazda already has a 2.0 rotary, the 20B used in the Cosmo back in the mid-90's. I'm guessing they'll do basically what they did with that, and just slap another chamber on the Renesis.
As nifty as turbo charge'd rotaries are, and as insane as the HP numbers you can get out of them are, the reliability is a crippling factor. A normally aspirated triple rotor would be really cool and a lot of fun to drive.