Couple of notes about maps.
Metro in conquest is pretty unbalanced, it favours the side that starts above ground. We were playing against a superior team (they killed us in the maps before and after) yet they couldn't penetrate the middle checkpoint, we had control of the 2 checkpoints for 95% and won. When it was their turn they had control of the three checkpoints.
Damavand peak is pretty crappy in conquest. It has two very close checkpoints outside each end of a HUGE tunnel. So both sides take the checkpoints and then infantry and tanks fight it out in the tunnel for the middel point. Yes you can get a chopper and get behind the lines but it's rarely effective because you have so many units spawning back there.
Those two maps definitely feel foreign in conquest, pretty sure they are designed for Rush.
Grand Bazaar is actually pretty good in conquest, lots of alleyways, lots of ways around. It's not very fun in rush mode (really bad chokepoints). In conquest you get a lot of fight in the middle alleyway but it's not abused and nor is it forced. It's actually fun to fight in there from time to time, even had an APC shooting rounds down there lol.
I think we all know caspian and it's a decent conquest map, operation firestorm seems pretty decent so far, haven't played enough to judge. Actually had a lot of fun with that in team deathmatch which is just the middle section. Seine crossing seems pretty crap with 64 players, way too open and one team can practically corner the entire other team to one checkpoint and just rake in the kills.
If I had to guess the maps that will be most popular in conquest it would be kharg, firestorm, caspian, canals, bazaar. Tehran is alright but can get cramped and seems laggier than other maps.