The flyer was in my room at WL yesterday - I booked my September trip with it. I have never heard of a specific resort not participating. However, the fine print does say "This offer is only available to guests of select Walt Disney World resort hotels." so it's possible that CR has chosen not to participate. Maybe it's because they don't seem to have much trouble filling their rooms since their inventory was reduced by BLT.

When I booked my BB yesterday, I wasn't told that any resorts were off limits as far as booking goes, so I assume I could have booked CR if I wanted to (I wanted an Epcot resort for that trip).
Since my December dates aren't covered by the bounceback, I don't think I'll be trying to book a BB when I'm at CR in July. But I will certainly keep my eyes open to see if the flyer is there.