Hey SD.... My account is credited each yr. I have the more expensive of the two that are offered. I thought both offered the free night. Going into marriott.com it looks like just the one card has that benefit. It's probably worth the difference in the annual fee to get the added bennies..take a look.
There is also a Megabonus going on, that gives you a free night for each two stays, up to 2 stays. Some others may get a different kind of offer on their Megabonus offer. You should be able to see which one you have, by looking at your Promotion Central on your sign-in on Marriott.com.
If you look at changing to the Premier card, check on the 50,000 points and the annual free night every year. It seems they don't give some of the extras to people who switch cards, since those introductory offers seem to be targeted at getting new customers only. There have been a lot of discussions about the credit cards in different threads on this site over the last few months.
hoosier, this offer sounds more like the Summer Bonus than a credit card offer. Check Promotion Central in your account and see if you have an additional offer. Most Insiders have reported a Summer Bonus offer as well as an offer called the Escape the Everyday. My promotion was stay 2 nights at a Springhill Suites and earn 5000 bonus points.