I noticed a horde of multiboxers in Eastern Thanalan the day of the emergency maintenance, and they seemed to be up to more than their usual shenanigans. They were just winking in and out of the zone, standing two feet from a low level quest npc, all of the bots being low level themselves. They were there most of the day, and weren't there after the patch. Could be entirely unrelated, but if they were somehow repeating a quest for a silver or gold allagan piece reward, they would be raking in tons of gil per minute.
If such an exploit were discovered, SE would obviously do an emergency maintenance to remove the issue, but wouldn't list that specific info in a patch note so that Gil sellers would not be warned. And assuming the dyeable valentine's day clothing was already finished and in queue to be added to the next hotfix, THAT data would have been announced in place of the offending exploit.
