This is complete speculation on piece count. I realize there may be more or less unit types than I listed, so don take it too serious. There also might be some unit count variations among countries.
8 infantry
5 tanks (2 new sculpts confirmed)
5 fighters (2 new sculpts confirmed)
3 bombers (2 new sculpts confirmed)
3 battleships (HMS hood will be marketed as a battleship not a cruiser)
3 aircraft carriers (1 new sculpt confirmed)
5 transports
Thats 32 pieces.
I suspect subs will get scrapped. They are overly complicated for a “simplified” version of the game. Plus most of the submarine rules won’t apply without destroyers which I agree with questioner won’t be in the game. Also note that although infantry and transports don’t have any confirmed new sculpts, it would be implausable to have A&A without them. It’s not implausable to have a&a without the units I listed.
Once again this is pure speculation and I’m likely wrong.