I'm still waiting for Lawrence of Arabia. It was originally announced way back in 2008 or 9 & still isn't out...
The Indiana Jones Trilogy (which is supposedly in the works) is another big one. And of course the original cuts of the Star Wars films (all 6 of them now, as they've ALL been changed in some way for bluray).
I wish Criterion would do a full restoration of Inagaki's Samurai Trilogy. It's SO good (with fantastic cinematography) & the dvd's are awful laserdisc ports.
Jurassic Park is finally off the list, thankfully. And Jaws should be too, soon.
More Errol Flynn stuff is a great idea & I'd like to see more Harryhausen stuff too (even though I still need to upgrade all the ones that are out all ready to blurays).