BWAHAHAHAHAHAHAHA!
Gawd damn, you just made my day!

Sierra/ActivBlizz was not Troika's only publisher. Atari published ToEE.

Maybe both then?:)

And considering that ToEE was a D&D game, that turns the rights negotiation into a clusterfuck so if troika are involved, it sure as hell won't be all 3 of their games coming
You have a sick mind sir and I am proud to know you!

AS in fact I did. Midway Arcade Classics 2&3 in one pack on D2D ;)

Just because the rights are difficult to get doesn't mean GOG won't, can't or didn't get them. I do agree, if that clue references Troika (again, I'm not so sure it does anymore) which would mean at least one of their publishers is coming to GOG, it is more likely to be ActiBlizz and therefore we'd only ever see 2 of Troika's 3 games... at least for now.
So let's assume that the clue does refer to Troika and therefore ActiBlizz; what games or devs would fit the other clues and still lead back to ActiBlizz?

It's not just going to be some new games, that would be incredibly anticlimactic.

I've had a thought.
History overlaps with the present time = Time Splitters
The return of Karmic awareness = Deus Ex
Two different characters but they complement each other beautifully = Kane & Lynch
Hey its EIDOS/Squee
Or I am just messing with you all.

TimeSplitters was never on PC.

I didn't see anyone post the new twitter clue
"How about another clue for lunch? They are two different characters, but they complement each other beautifully."
I have no idea what that means.

I've added all the official clues to the OP. People seem as confused as ever.

I refer you to this: "Or I am just messing with you all."

Well Bethesda have released their first two The Elder Scrolls games for free and I wouldn't put it beneath them to try to make some money from them buy releasing them here and pulling the free download. They could really benefit from The GOG Treatment too.
DON'T SAY IT!
I've tried to cleanse my memory every time I've thought of that. SSI and SSG games are my most wanted games to get on GOG and I don't want to get my hopes up. :/

All three clues so far point to Planescape: Torment.
It's got the "karmic awareness" aspect, in a manner of speaking. Your actions affect future events, so well in fact that this is largely what people continue to praise about P:T.
History overlapping with present time? Well, the protagonist is an amnesiac who is attempting to recover his "history" through interactions in the present...
As for the two different characters clue; there's a few ways that points to Planescape: Torment, but the most obvious way I can think of pertains to the game's conclusion, which I'd rather not ruin for you since you'll be playing it come Thursday!
Right?

EvolveTom has been twitting up Square-Enix.... and im talking PR amount... could this be a clue?
Also this has to be a massive publisher but damn... damn damn damn.... this is nuts... and you really cant get more different from core game dynamics then Blizz/Activ
Planescape has the horny floating skull, thats the 2 actors if its talking game Euro..