With Konami's Metal Gear Solid: Master Collection Vol. 1 officially announced but still readying for its launch this October, it might seem premature to be discussing Vol. 2 - but here we are with apparent word of at least some of what it'll contain, including Metal Gear Solid 4.
It all started after Twitter user Nitroid began poking around the Metal Gear portal website and noticed a spot of oddness with Konami's updated Metal Gear timeline.
The gist of the discovery is that Konami's revised graphic featured a number of inactive buttons for old games pointing to new pages, leading to speculation that these particular titles - Metal Gear Solid 4: Guns of the Patriots, Metal Gear Solid: Peace Walker, and Metal Gear Solid 5 - were being primed for a re-release as part of a Master Collection Vol. 2.