[UPDATE- This is not limited to Aspire cards, other AMEX cards are getting the offer also]
Got an email today for 17X points for spend on my Aspire card at Hilton portfolio properties until September 5th.
Usually this card gives 14X points for spend at Hilton properties.
This promo can of course be stacked with the current "More Nights, More Points" double and triple points promotion, such that on stays of 3 nights or more, Diamond members would earn 10 base points + 10 points for Diamond bonus + 20 promotion bonus points + 17 Aspire points = 57 points per dollar for all spend on your Aspire card at Hilton properties until September 5.
If you value Hilton points at .5 cents each, that's a 28.5% rebate on your spend. Not bad.