Last year we thought we had 'lucked out' when, at check in, they put our annual passes on our KTTW. We thought, "Great, we actually got a hard plastic AP. No more cheap paper passes!" Good feeling all went away when we attempted to use our AP discount at World of Disney.
There is no space allotted on a KTTW card to put your passholder ID number, which is required to use your discount. By attempting to make our life easier, the check in cast member actually made it harder, since we ended up at DTD's ticket counter having our AP and KTTW separated, and new cards reissued. Only then could we go back to WoD and purchase using our discount.
So, if they try to combine everything on your KTTW, insist on having them separated.