I think it would be awesome to have some super odd Annihilation/Arrival sounding vocals. Super dry, upfront, with a slight pitch wobble. Always found that to be creepy.I'd love to get other solo voices recorded (male and female) and turned into playable true legato VIs like Audio Imperia did with Merethe Soltvedt in Jaeger. Not necessarily famous vocalists - just great singing voices. Some safe/generic and some really odd timbres (husky, nasal, ethnic voices from different parts of the world, etc.) I'd be all over that.
Oh, and where can I pre-order Daniel James' Vision of Hans Zimmer Strings? I'd pay $800 for that.