I did the same and didn't notice it until I watched a movie on it at night. Definitely some bleeding near the bottom on the bezel. Not sure if Apple would consider it 'bad enough to swap out. Or if I want to go the the hassle as it is only noticeable at night.
They will swap it with a brand new one, as it is not an issue that can be fixed by a hardware update or part change. I went into an Apple retail store and showed them mine and they replaced it within 5 minutes, without even asking much questions. They will always have replacement units in stock, apart from sealed ones. The new one still has the issue so at this point in time, it's just pure luck getting an iPad 2 without backlight leaking issues, I'd advise wait till next quarter (preferably June or late May) so that Apple will fix this issue in their next production update (hopefully).