Polish attacker is 2 speed and 2 armor, using an LMG and Assault rifle (700 rpm AR), so Ash will still be relevant due to her role as the rushing attacker. Polish attacker seems to be an inbetween of Ash and Ying, providing breaching power (not as potent) and disruption (if flashbangds worked all the time then it would be less potent) to give the team as a whole an advantage.
Korean attacker seems to be a specialist, having a DMR and Shotgun only for parimaries, and having 2 machine pistols. The gadget is, in my best guess, a way to make defenders create an audible noice that will show where they are. Meant to either reveal positions or reveal where roamers are, but it is unkown how this ability will be activated.
The Korean Defender is interesting, since he appears to have a shortened AR like that of Yager, and then the same shotgun and machine pistols, giving him that uniqueness that the attacker also has. His gadget will be hit or miss, if he is just invisible to drones then he’ll work fine since he will be hard to spot, but if there’s a jamming or stutter then he will be obvious.