Over on EU. I'm seeing 5 dd games daily since the update. Now I thought there was a hard cap on the number of dd's. So I messaged support. They refer to it a "soft limit" now.
This is what I got back
Thank you for contacting Player Support.
Explanation of "soft limit" / "soft rule": the matchmaker tries to fulfill it but ignores it when players have to wait too long for a battle.
soft limit: at most 4 destroyers per team.
soft limit: at most 5 battleships per team.
More info here: https://wiki.wargaming.net/en/Ship:Matchmaking
If you have any additional questions, please contact us, we will be happy to help.