1] A starter adventure that includes dungeon, wilderness, nautical and urban components. It should offer DM advice for running adventures in such areas and for expanding upon the adventure to build a sandbox campaign.
2] Greyhawk Campaign Setting boxed set, complete with a huge map that draws inspiration from Darlene's Greyhawk map... but manages to improve upon it. To these ends, the map of the Flanaess should be a printed on heavy card-stock tiles that can be flipped to show a map of The City of Greyhawk.
3] Guide to the Planes boxed set... including maps of planar locales (such as Sigil), a DM's guide on how to run games set in the outer planes and a planar bestiary.
4] Classics Revisited compendiums. Classic adventures, grouped by theme and organized into adventure paths, that are updated to D&DNext. Several of these would be released.
5] Deities & Demigods. A guide to the gods and other powers that players worship or revile. This would tie into the Guide to the Planes and Greyhawk boxed set. It would also give notes on religious organizations and orders, and on how to use these groups in your game.