Yes, Disney will transfer your luggage from one Disney resort to another. You can bring it down to Bell Services/Luggage Assistance or call for them to pick it up and then, once it's in their possession, leave for the parks. It will be delivered to your new resort in the late afternoon, probably around 4 PM, possibly later, and you won't have access to it until then, so be sure to keep with you anything like medication or bathing suits that you'll need that day. You can pick it up at the new resort on your way to your new room or call from your room to have it delivered. Expect to tip on both ends of the transfer.