I would wait till feb 27th and if nothing has come by then spend all your hearts. They did say the event will end on the 28th meaning the hearts and what they buy will disappear unless they decide to extend it. I think the update will come sometime soon not any later than the 14th or possible on the 14th for vday, adding ralph and the bunch of other new items giving us still 14 days to collect hearts and do quests which seems like plenty of time, I would think :?: