Here is WDW wording of the special:
Kids, ages 3 to 9, can stay and play for FREE when you buy a non-discounted 4-night/4 day Magic Your Way room and ticket package at select Disney Resort hotels for select nights February through October 2011.
Book by February 13 for stays most nights February 17 to April 16, 2011.
Book by March 27 for stays most nights April 28 to June 14, 2011 and August 14 to October 1, 2011.
Number of rooms allocated for these offers is limited. Tickets are for one theme park per day and must be used within 14 days of first use. Child must stay in same room with adult. Maximum of 4 Guests per room.
CBR is one of the selected resorts, so you are fine there.