Eek! Would hate to file the mishap report for that one! ;)
http://video.foxnews.com/v/2551386264001/spacewalk-aborted-after-astronaut-nearly-drowns-in-own-suit/ (http://video.foxnews.com/v/2551386264001/spacewalk-aborted-after-astronaut-nearly-drowns-in-own-suit/)
Have they figured out / said what it was? Early reports were "it doesn't taste like drinking water".
My guess is a malfunction in the liquid cooling vest, since it uses water tubes sewn onto the garment, and since it's a full-body garment. That's the only place I could think that much water would come from.
(http://upload.wikimedia.org/wikipedia/commons/e/ec/Lcvg.jpg)
(Wish we had that with firefighting in my area. Stupid southern summers!)