My Aces flights posted really fast, too-- they were on about a week or 10 days after the flight. Everytime I reviewed my credits with a LatinPass rep, they automatically read it as "two Aces flights, one that counts as SAETA...." so you shouldn't have to explain it.
I have heard time and again from different LP reps that flights, hotels, and car rentals only need to be completed by July 1-- of course the faster they post, the sooner you get miles, but they don't need to be on the account by July 1.
After I visited the LP office, and the more I talk with them, the more I have confidence that they will make good on the promotion-- consider that at 35,000 miles per US-Central America round trip, with 300 "millionaires", that's the equivalent of 9000 trips-- spread across 10 airlines, that's 900 trips per airline, or about 6 full A-320 round trip flights. Considering the publicity they're getting as having the best FF promotion of the Millenium, that's a small price to pay.