The GDC is on March 11th.

You can check out the Steam Forums for a link to an IRC server where everything is being talked about.

Right now, we just have to leave all the puzzle solving to the guys with the BBC equipment. Also, do not call the number if you find it. You'll only be getting in the way.

Here is the link to the Steam Portal forums.

Check it constantly because people are finding things every 30 seconds. I've found a couple things myself.

Quote Originally Posted by Bonsay
This is awesome, I haven't seen it before. Thanks Marvo.

I think Valve said they won't be giving us anything about Ep3 and portal in 2010, which made people quite pissed. But seeing these things makes me wonder if perhaps it's just that they are doing "their thing" again, which would be pretty awesome. On the other hand they may just be doing this to compensate the fans after getting caught in their standard practice of "Valve time" with all the delays. Anyway, all other game developer companies are so distant and "commercial", but Valve just has this wierd way of doing things and connecting to their fanbase. Makes me all excited about HL again.

Oh and did you see the chicken robot from Portal 1 in those pictures? very cool.
Valve hasn't said anything at all about Ep3.

We can only hope they say something during the GDC or E3, which E3 is in June.

However, I would believe they will most likely talk about The Passing, which is the Left 4 Dead 2 DLC that is supposed to have both the L4D Survivors meet up with the L4D2 Survivors.