Looks like to bonuses for Extended Payment Option are back. I just got a 10k offer on my Biz Gold today. Came via snail mail and expires 11/1/2016.
To see if you are eligible try americanexpress.com/openpayovertime59
Judging by the url I am guessing that this is probably available only to Biz card holders, and possibly only Biz Gold.
Good luck. I love free points!