Valve E3 surprise is "Portal 2 themed"

Valve's confirmed that the surprise it has planned for E3 is "Portal 2 themed".

Confirmation of which came at the end of a note from the developer, which also confirmed it had delayed the game into 2011.

The note said:

"To ask questions about how close we all came to dying, or to ask futile questions about the previously announced E3 ***PORTAL-2-THEMED-FOR-GOD'S SAKE*** surprise..."

So there you have it. Not Left 4 Dead 2: Episode One, not Half Life 2: Episode Three, not Half Life 3 or Source Engine 2, as we were told.

Let the speculation end. Once. And for all.