Portal 2 WTF?

I've been operating in a fishbowl since I started Time's End. I haven't played many games, I haven't read any gaming mags and I've stayed away from gaming news sites. All my time at a PC has been focused on making TE. And then I found out about Portal 2. Portal 2 - set hundreds of years into the future and again starring GLaDOS and Chell in a broken-down Aperture Science facility. They even released a timeline of events leading up to Portal. Oh shit! I made an HL/Portal/Life's End/HL2 timeline in order to make sure all the time travel in Time's End would make sense. The story is pretty tightly wrapped around that timeline. Now Valve come out with one? Lucky for me, my and Valve's timelines are almost identical. Everything still fits. No massive story-breaking contradictions. Phew! (then again, would anyone have even noticed or cared if the stories were incompatible?)