This is pretty much standard across the hotel industry. Connecting rooms, bed, and smoking preference (not an issue at Disney) are requests only, and while it usually not a problem to get your request, in the event of a sold out hotel there is the chance you may not. I hear lots of stories about people having no problem at all getting their connecting rooms, but there is no guarantee. If it is of high importance to you, then I would call the hotel directly and speak to a front desk manager, etc. While they will still probably say "we cant guarantee it" to cover their tail, most good hotel managers will make notations on the reservations, and perhaps even pre-block the rooms, which usually decreases your chances of having a problem. As a former hotel manager, if a guest called me with a specific request, you can rest assured I made sure it happened, rather than face them at check in with bad news right at the start....