-=- Theories for Half Life³ ? -=-
Well, because of the "Slow teletransportion" that happened, I think it will actually be more of a time travel machine sort of thing.
But as for the actuall story line, I think that Gordon Is Going to Mess Up something accidently
(as now he HAS to work for the G-man's Superious (or so I was lead to beleive) ) And the what happens is not good, then, People from the futr, (probly Dr. Klein with Calhoun)
But from an alternate Universe along the same timeline, yet split, Come and Get Freeman and show him the good futur,
(Sorta like in Ecco The Dolphin 2: Tides of time or Back to the futur 2) And He Hopes from Reality to Reality, one, Dominated By the Xen blob and Combine, the other being where the combine has been defeated, and at one point, because of his time / universe hoping everything gets really messed up, so he has to go back to the exact moment (and decision / actions) that created the time split, and set it all right,
I think that the ending would be pretty cool if he ends up doing not either a futur where everything is all good, or everything is all bad, but a futur that is somewhere in the middle, where Combine / Xen / Humans live together, where theya re forced to live together, maybe becasue of a body fuse or seomthign?
Where they are hosts to each otehr? Such as the Humans can not lvie without there combine part, and the Combine can not live without there human part.
So yeah, that would be pretty cool in my oppinion, hope you follow and understood.. or at least even READ it...