I'm just as excited as everyone else at this announcement and will surely make another pre-order as soon as practicable. Meanwhile, I wonder what is possible given the 'Blu-Ray debut' stipulation.
If we are obliged to stick with 1947/8 and later shorts, I would like to see shorts from the post-Golden Collection 'Super Stars' DVDs get some reevaluation. Besides the ones that were given phoney widescreen crop jobs, the remastering on the later discs (I'm thinking the Porky Pig & Friends and Sylvester/Hippety Hopper ones in particular) featured some skewed color grading that I've love to see undone.
Since some of the shorts on those discs, such as 'The Pest Who Came to Dinner', 'Dog Collared' and 'Pop 'Im Pop!' were de-Blue Ribbon-ized with their original opening rings, raising them up to Blu-Ray standard ought to be an easy win and would earn guaranteed goodwill from the animation community. That's if there's still no possibility of genuinely lost title sequences being found/reinstated, that is.