Hi Matthew!
Thank you for bringing your question to the Disney Parks Moms Panel!
What an amazing surprise for your wife! You are definitely getting the "Husband of the Year" award.
Walt Disney World Resort makes it very easy for Guests to have split stays. My family and I did a split stay this summer and we really loved how it gave us two different locations for our week. On the day you check out of
Disney's All-Star Movies Resort, you can take all of your luggage to the Bell Services desk. They will actually transport it for you to
Disney's Wilderness Lodge. It should arrive to your new resort by mid-afternoon. Just be sure to keep out anything you will need before then.
It's fairly customary to tip your bellman when you pick up your luggage, so you may want to keep a few dollars handy for that.
I hope this helps. Please let me know if you have any other questions and I just know your wife is going to love the surprise!