I have so far been unsucessful in getting a 3 bedroom, but I was trying for this summer at one of the off-site locations and I didn't put my request in until after Disney had already made their bulk deposits. In talking with RCI, I get different stories from the reps about 3 bedrooms. Go figure. However, I've heard from enough reps to conclude that disney deposits very few 3 bedrooms. A few of the reps I talked to had never seen one offered in RCI, before -- but RCI reps are always pessimistic and will tell you more times than not that you need to request something else.
With that said, the only way you will ever know if you can get a 3 bedroom is to place an on-going search. I've been following these boards for a long time and I have never read a post from anyone who said they got a 3 bedroom DVC exchange through RCI WEEKS. There was a 3 bedroom Old Key West for this July in RCI POINTS that was deposited in January. I remember seeing that unit and reading a post from the woman who grabbed it.
Also, keep in mind that no one will respond to a thread about DVC 3 bedrooms to say they got one (except for the post about getting one last May) and to share how they got it. This is because no TUGGER has ever gotten this exchange, or they have gotten the exchange but didn't see your post or they have gotten the exchange but are keeping it a secret.
From other forums, I know that 3 bedroom DVC exchanges are possible but I think they are far and very few between. When you call RCI to request a 3 bedroom I can all but guarantee the rep will tell you it will never happen and will try to force you into accepting a 2 bedroom or a 3 bedroom. If you take a 2 bedroom, you will most likely get several matches.
From my own experience, this past January, I waited for a couple months for any 3 bedroom DVC with no matches. Then, I switched to a 2 bedroom and I got several offers before I decided to go with a different vacation.
Don't be discouraged to try for a 3 bedroom just know that you will get multiple posts from TUGGERS who have never gotten this trade and will tell you it is impossible. Then, you will call RCI and they will tell you it is impossible but bottom line is only you will know if it is possible or not if/when you put in a trade request. It is more than sage advice to have a back-up plan, for a Hilton 3 bedroom or a 2 bedroom DVC exchange, instead.
If I were you I would have two trade requests going and when you get matched with something other than a 3 bedroom DVC buy the insurance but keep you 3 bedroom request going, just in case.
Good luck, and let us know what happens.