It's official. Hideo Kojima himself made the announcements that both Metal Gear Solid and Zone of the Enders will be getting HD collections, not to mention for both PS3 and Xbox 360.
The Metal Gear Solid HD Collection comes with Metal Gear Solid 2: Sons of Liberty, Metal Gear Solid 3: Snake Eater and Metal Gear Solid: Peace Walker, all in HD. The PS3 version supports "transfarring," meaning that save files can be shared between the PS3, PS2 and PSP.
The Zone of the Enders HD Collection will include both ZoE and ZoE2 and will be available for both platforms as well. Only the PS3 version supports "transferring."
The MGS HD Collection is scheduled for a November 2011 release while the ZoE HD Collection is set for release next year.