From BBV:
http://forumserver.twoplustwo.com/showfl...=0#Post12097244
Cliffsnotes: A few accounts (3-4) are alleged to be able to see holecards of other players, and they played high stakes tournaments and cash games.
This could be very bad for online poker/gambling in general.
EDIT: The thread was moved to the mod forum, the sources seem to be adanthar and bicyclekick (both mods).