I have managed to look unto this and found out mp3's are still supported, and that in-comba/out-combat/both(1/2/3) tags have been replaced with 100x more specific system .
So far i have only managed to get my amon amarth play for last 1/3 of a battle, with enty "<name>.mp3 5120 5120", so if devs release list of those or we figured out where each code is played we can make make it happen
