It behooves them to keep the best stuff internal, or at least greatly limit any API usage to avoid giving the goods away to other labs they are racing with.
Which, presumably, is the reason they removed 4.5 from the API... mostly the only people willing to pay that much for that model were their competitors. (I mean, I would pay even more than they were charging, but I imagine even if I scale out my use cases--which, for just me, are mostly satisfied by being trapped in their UI--it would be a pittance vs. the simpler stuff people keep using.)
