Konami's producer Noriaki Okamura stated, "We definitely are aware of this situation with ... you can probably connect the dots," hinting at future projects.
Even with this coyness, most evidence from multiple sources indicates that MGS4 will indeed be part of the anticipated upcoming Master Collection Volume 2.
Okamura also mentioned, "Right now we still are internally concerned about what we should be doing for the future of the series," implying strategic planning.
Despite Konami's silence on official announcements, the overwhelming datamined evidence suggests that both MGS4 and related titles are expected to be featured soon.
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