Thanks to Hawachan for posting the TDR schedule for next year in the TDR forum, and Fukai for translating it with Google translate.
Here's the original OLC press release:
Anyway, it looks like next spring at Tokyo DisneySea, Duffy is being brought front and center...literally. It's an event called (roughly) "Spring Mickey Duffy Provo Di Do". I have no idea what the actual name will be called, but maybe something like "Mickey and Duffy's Spring Provo Di Do".
It looks like it may be something like Spring Carnival, only with Duffy and Shellie May at the center. It will take place in Mediterranean Harbor, and will showcase the different ports, possibly with water barges. It says mini-show, so who knows how large this event will be. My guess though, is that it will replace Sweet Duffy, and we'll get something new. I'll miss the Valentine themed events of the past, and who knows, maybe they'll do both. Still, it's interesting for sure!