Since either this thread or your other
thread elsewhere asking the same question will get locked, I'll repeat what I said there:
If the studios felt they could make a profit on those titles on HD DVD, they are surely going to try and make a profit on them to the much-larger Blu-ray customer base. It's just a question of when the individual titles get released.
As for buying up titles now, that's entirely down to whether the cost of an HD DVD player and being able to watch them now outweighs the (unknown) wait for them to appear on Blu-ray.