Anyone have any idea when this offer might expire? I was planning my next App-o-rama around mid-September (90 days since my last). Should I go ahead and just take this offer or try to wait? If I take the offer now will it negatively affect my App-o-rama? (I wasn't planning on doing any more Amex apps)

I'd really like the SPG miles so that I could transfer to airlines as I'm having trouble getting enough miles on any one airline to do an international first class trip.