Let's not all be premature. I'd like to see some policy positions or a platform before we rush to call them centrist. Brown is certainly trying to make the party more inclusive, and is making noise (a lot of noise, given his recent statements on carbon pricing) that he wants to move the party towards the centre, possible adopting some of the more pragmatic conservatism of the Davis years. But the devil will certainly be in the details.
It's nice that Brown marched in the Pride parade and all, but I won't personally be rushing to erase the social conservative label he has until, for example, I see how the PC positions on the sex-ed curriculum and GSAs evolve (if they evolve at all).