Speaking as someone who is NOT a developer and NOT privvy to the developers' thoughts on this issue... I suspect the games won't be combined into one exe. They are six separate games, with six separate sets of assets, game logic, etc. I don't think it's as easy as stringing them together, you'd need to copy all of the resources for each of the games into one big game, which would be a lot of work and has the potential to introduce a lot of problems. Plus, as others pointed out, you'd lose the nuances of the opening and closing sequences.
Six big games with one launcher is something we've talked about a lot, but I think attempting to put the six games into one file would be more trouble than it's worth.