@MyJetpack
They don't want to bring BF4 maps, so I guess no Peal Market and no Operation Locker, even though they would be welcome additions if you judge by their popularity back in 'the day'. If they could bring BF4 maps, then I'd vote for replacing the BF3 version of Caspian with the version for the second assault DLC of BF4 (because this one is better IMO, but it is not 'infantry focused', so it does not belong in 'your' list).
For infantry focused one out of BF3 my votes go for:
Metro (even then the BF4 version is better!), not because I personally would want to play it, but because it is without a doubt THE infantry only map that comes to mind most readily and it was and still is very popular and running 24/7 on those older titles. It just is not fun at all in the 64 player version (for most people -- some really seem to enjoy this chaos) and therefore would need a 32 player version that cannot be mixed in with other maps in a rotation.
My favorites would be either 'Epicenter' or the pretty much underrated 'Talah Market' (or actually all of the Aftermath DLC maps of BF3, maybe with 'Markaz Monolith' being the one I liked least of those 4).
EDIT: now that I think about it, most of those maps were also played best on 48 player servers as also for them, 64 are too much. We had a 48 and 64 player server and I played many matches on both and I can say without a doubt that almost always the 48 player matches were much better. At least according to my aging brain. But I don't like chaotic matches and the fact that 64 players already brought a lot of chaos by the number of enemies you had to face when capturing or defending a flag alone was THE factor that I say 48 is better than 64. So, your mileage may vary and I can understand that for SOME people, those 64 player matches might have been more fun.