Valve has announced that Portal 2, earlier scheduled to release February 11, 2011, will now be hitting stores and Steam on April 18, 2011. You can read Valve's version of the announcement below,
Valve today announced that Portal 2 — the sequel to the ground-breaking title that won over 30 game of the year awards, despite missing its original ship date — will now be available the week of April 18th, 2011. This two month slip not only marks the shortest delay in Valve’s proud tradition of delays, it represents the approaching convergence of Valve Time and Real Time. Though this convergence spells doom for humanity, it will not affect the new Portal 2 release date.
Whether the delay was expected or otherwise, we have a good feeling that it's going to be well worth the wait. To checkout all the latest Portal 2 screenshots and videos click here.