iLife and iWork updates.
iWork to get Numbers.
iLife to get update to all apps. Something tells me we will see iDVD give support to Blu-ray.
Mac Pro's will have support for built-to-order Blu-ray drive. Just speculation but I personally never understood the meaning behind having a dual optical drive of the same function.
Other than that, iPhone would be nice, iPod update would be nice (for the real video iPod).
Realistically I dunno what else to expect.