Daqing Oilfields would be great as a Frostbite map I think. Also, Great Wall would be marvelous if we get the whole intended map instead of the nerfed map as featured in BF2EA. Great Wall is know as one of the maps that had been shrunk in size to cater a more Inf.based gameplay. In the original map for 64p there used to be Attack and transport choppers as well as mobile AA. Mashtur had the same thing done to it featuring 2 airfields placed far inside the redzone.
64 player maps should always require vehicles to be successful. I just would love to see infantry players be thought of when considering getting from one flag to perhaps 2 others at minimum. For example, on Caspian Border, there is a great dynamic of infantry based game play to be had on flags A, B and C. Since I do not run in vehicles all that often, I feel like I can contribute if I concentrate my efforts to take or hold the flags in this triangle: http://i.imgur.com/FSoBudD.jpg All the while, vehicles play a very important roll as well.
Some more leaked details about Frostbite 3.0 for BF4: http://bf4central.com/2013/03/battlefield-4-engine-frostbite-3/
All the info I have seen to date said it's going to be 'Frostbite 2.5'... probably nothing more than a marketing thing. I really hope DICE learned from BF3, I'm looking forward to BF4. Good PC multiplayer shooters are becoming few and far between.
I'm all for a more refined engine. Frostbite imo has loads of potential. I more or less view BF3 as a really nice beta
I really dig this guys videos and he did a good commentary on the BF4 reveal: http://www.youtube.com/watch?v=2MwvcLWl5nA