Apple’s next generation iMacs might not just be Penryn updates as speculated earlier.  If they are one of the first  computers to recieve the  Intel Eaglelake motherboard (which support Penryns), they could also have some Blu Ray configurations as well.  Some of the specs of this board, set to be released Q2 of 2008:

When will we see these possible iMac udates?  Eaglelake is expected in Q2 2008.  Apple, however is known to get some Intel technology before it is widely deployed.

Apple’s iMac hasn’t been updated since the Aluminum enclosure made its debut on August 7th 2007.