Waner Bros has announced that it will be Blu-Ray exclusive effective June 1, 2008. So much for the denial of not going to make the jump to blu-ray exclusive back in December.
The competing formats create confusion that is keeping either format from mass acceptance. But since Blu-ray has been the clear consumer winner so far, I would say that WB has made the right move.
Another big producer who moved to Blu-Ray exclusive recently was Disney. And it seems like Paramount and Dreamworks are the only 2 left who are playing nice with MS and the rival HD DVD format.