Information from your EA account is now…well, in the hands of people that aren’t you. No clue who those people actually are — @LulzSec hasn’t taken responsibility, so it might be some other fringe group.
EA/BioWare have started taking precautions, one of which includes automatically resetting everyone’s passwords. That’s not much fun, but it’s necessary.
For more information, visit EA’s FAQ on the topic.
Kudos to them for responding quickly.