Hi-Def Digest has some interesting Blu-Ray news. Universal Studios has just announced that their first batch of Blu-Ray releases will be available on July 22 (Heroes fans will have to wait until August 26).
What does this mean for a Cloverfield Blu-Ray release? Universal dropped HD-DVD in February, and Paramount followed suit two days later. If Paramount is working with the same five-month lead, then they should start releasing Blu-ray discs around the same time. However, I suspect we won't hear anything official until after the standard DVD is released.