Yes and possibly no...
The free (for now) Castaway Cay 5K will continue to be held on days when a Disney ship is at Castaway Cay, and finishers have been getting a rubber finisher medallion. No shirt.
But I think you are talking about the Castaway Cay 5K Challenge, where you pay to sign up and get a shirt and a challenge medal after doing a Disney race.
I did not do the challenge myself, but from what I read from others that did (
@bumbershoot especially had some great, detailed posts), it sounds like the challenge is going away. Logistically it sounded like a pain (getting to Castaway Cay earlier than normal and holding the race twice - once for the challenge participants and a second time for the regular participants in the free race) and I have to wonder how much they really profited from it. There were numerous posts to runDisney's Facebook page about the CC5K Challenge held in January, but almost nothing about the challenge held in February after Princess Half weekend (and I don't think that challenge even sold out), so I think the novelty wore off quickly.
I think if you don't hear anything about one happening with Wine & Dine, it's safe to assume they've retired the CC5K challenge.