While I don't have a smaller re-popped TIE in front of me, just looking at a recent build-up video on YouTube that shows the new big 1/32 kit side by side with the re-tooled smaller "1/48" TIE, the smaller one looks to be roughly half as big or even a bit smaller. That means it's likely not really 1/48 scale but maybe closer to 1/64.
I also have not recently compared the TIE Interceptor snap kit to the MPC Vader's TIE, but if memory serves it is smaller. Thus, to me at least, it makes no sense to tool a new TIE bomber in scale with those smaller TIE kits. If they asked me, I'd say make it the size of the old MPC Vader's TIE. This would be studio-scale and a nice size. I agree that making it 1/32 would be pretty huge so it might not make a lot of sense.
I do hope we'll eventually get a DV TIE and TIE Interceptor in 1/32. Doing either shouldn't require making all new tooling as the existing 1/32 TIE parts could be integrated into the new kits (the same way Bandai did it).