My most anticipated since the dawn of the format has been The Abyss. Looks like that might be soon remedied, thankfully. It'd be nice to see a high quality 3D conversion, like Titanic and T2 (can't wait to see that one in theaters)! A theatrical rerelease would also be welcome.
Glad to see The Keep mentioned. Only a dim hope of that, I fear, though Netflix had it in 720p for a while!
Schindler's List and Gladiator are both on BD, though two posters above mentioned them.
For now, I'd like to see Forever Young, Truly Madly Deeply, The Prince of Egypt, and about a hundred others! Fortunately many of these are streaming in HD, at least.