Konami announced today that we'll be able to expect to see Solid Snake's debut on the PlayStation Vita on June 12, 2012. As you may know, the Vita version will be a bit different than the console version.
The major difference is that it will not include Metal Gear Solid: Peace Walker. It will, however, include both Metal Gear Solid 3: Snake Eater, and Metal Gear Solid 2: Sons of Liberty. The Vita version will also include a few Vita-specific additions such as touchscreen control.
Players will be able to use the touchscreen and rear touch panel to do things like zoom-in on scenes, peek around corners, cycle through weapons, and rapidly cut with the knife.