Metal Gear Solid Master Collection Vol. 2 Rumours and Clues.
The source code on the Metal Gear website has led to speculation that Metal Gear Solid 4: Guns of the Patriots, Metal Gear Solid: Ground Zeroes, Metal Gear Solid V: The Phantom Pain, and Metal Gear Solid: Peace Walker could be included in the Metal Gear Solid Master Collection Vol. 2. Placeholder code for these titles was found in the website's source code, indicating that they could be swapped out for actual links. However, Konami has not confirmed anything yet, and this is still considered a rumor.