We just got two for depositing each part of our locked off Mountainside week. I saw it (pending) first in the "My History" section of II under "Rewards". It took awhile for the actual email and AC to show up because they have to verify that Marriott has that week and deposits it to II. The AC is grid until 59 days out, and then free for all areas, and is good for a year. It has the different fee for studio, one bedroom etc, but we will be able to use these!
We also just received one (grid only) only good until March 6...much harded to schedule, but only $259 for any size unit.