Paramount and Universal were bound by contract into HD-DVD, I'd imagine there is a get out clause if Toshiba abandons it but as they haven't officially abandoned it yet, Paramount and Universal can't officially get out of the contract.

I expect the following shortly (within a week or two) after Toshiba officially announces dropping HD-DVD:

1) Paramount/Universal announce a move to Bluray

2) Toshiba announce a move to production of Bluray kit

3) Microsoft announce plans for a Bluray 360 addon drive