UPDATE: BF4 server version R53 (166406) has been sent to us by EA/DICE. We have scheduled it to roll out to all servers that do not already have it at 2am PDT / 4am PDT / 5am EDT / 11am CEST on Saturday, October 10.
This is the version that includes high tickrate support. Dedicated server customers will be able to experiment with different settings for the tickrate by using the "Managed panel" selector and changing variable vars.OutHighFrequency command, either through rcon (it will require a new round to take effect) or through the startup.txt file. We will expose a version of this feature for standalone server customers through an additional-cost option in the near future (we are still determining an appropriate price point and limitations).
UPDATE: (R52 Server Update) on Sep 14. All changes apply to all platforms unless explicitly stated otherwise.