In the 2009-10 rule book, 3-3-5-a-2 reads, "The player(s) may remain in the game if his team is charged a
timeout in the interval between downs or the period ends." That statement has been removed from all of 3-3-5 in the 2011-12 rule book.
However, both 3-3-5-a-2 & 4 in the 2011-12 book state that that the injured/blood-soaked player may not return without approval from medical personnel. That is consistent with the editorial addition of "In any event, he may return only on the approval of his team professional medical personnel." to this year's AR 3-3-5-II.
I'm betting they inadvertently failed to delete the first sentence in the Ruling for 2011-12 AR 3-3-5-II.