I really don't see how this going to change much of anything.
Based on the press release blog (not the online menu), this isn't converting a bakery into a deli, this is changing a bakery SIGN into a deli SIGN. The are serving exactly what they have served for years -- 2-4 sandwiches and some baked goods.
I would guess the name change is because guests didn't think of a "bakery" for lunch/dinner food, which increased the constant complaints about the lack of quick options on the Boardwalk. Now they will have the same problem, because people won't think of a "deli" for breakfast, although those complaints can be tempered by the new coffee place of the Boardwalk lobby.
Call it "Boardwalk Quick Eats" or some such nonsense, and the problem is solved.
The more interesting part of this to me is that it's being done so quickly. I would expect Disney to spread the CAPEX for a sign change across three fiscal years, somehow.