They were definitely thinking about keeping the E a galaxy class. ILM stuck the letter on, and as late as when they prepared the enhanced Cd soundtrack for first contact, the 'tour' was showing the galaxy class with the Sovereign interiors.
They had obviously gone with the new design before filming proper kicked off though, because of MSD on set and the spacewalk scenes.....but it is sort of a shame, as that ship was as much part of the identity of the show as the cast.
And God knows, with the amount of design and work that had gone into it, that model and to am extent, the sets, wouldn't have needed much of a refurbish to be film ready.
I guess with voyager needing the standing sets space, and wanting to make the films more resemble their Tos counterparts though it was all change. (there were the hybrid uniforms they dropped from generations, and the E itself shares quite a few features with the Connie refit...black cowling on the nacelles and bussard collectors, the wing stanchions, the return to a circular navigation deflector with no immediately discernable emitter. It's a cathedral of a ship.)
The galaxy side on looked pretty good too, very much like it was doing warp 6 even sitting still.
In some ways, much like Wrath Of Khan took the TOS films back a step technologically and made it more military, the Tng stuff also went back a bit for the films. But not as much.
Well, I think fans would have had "a lot to say" if they brought back an "E" identical to the "D", just like the "A" was identical to the Refit. Boo! Can't they come up with a new ship!
The glass is half empty and half full.