First Portal 2’s E3 showcase was said to be cancelled, although there will be a “surprise” related to the game at the event. Previously there were many conspiracy theories and rumours saying that it would be Half-Life 2 Episode 3, Half-Life 3, and Source Engine 2, or even Duke Nukem Forever that would be the big surprise. Most of these if not all have now been dismissed as just speculation.
Now Portal 2, originally said to be coming out this year sometime, has been pushed back in 2011.
“Representatives from both companies acknowledged that public safety concerns factored into the decision,” the release itself reads. “They went on to say that even though Portal 2 will arrive slightly later than planned, all life on earth won’t instantaneously stop as every molecule in your body explodes at the speed of light, which is what would happen should a rip ever appear in the fabric of Valve Time.”
"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 or, less futilely, to schedule an appointment to attend a 'Portal 2' screening at the Valve booth during E3, please contact Valve's delegate to the EU's Valve Time Studies Group, Doug Lombardi.”
Source: Valve Announces Portal 2 to Ship in 2011 [Gaming Today]