Via [url=https://list.valvesoftware.com/]HLDS[/url] and [url=https://store.steampowered.com/news/50098/]the Steam store[/url]:

[quote=Valve]- Fixed an exploit related to the Flamethrower shooting long distances
- Fixed being able to build outside the map on Badwater
- Fixed being able to build through gates on some maps
- Updated/Added some tournament medals[/quote]

Rumor has it:

- Here's a list of added tournament and event medals: FBTF 4v4 Open/Access/Elite, CLTF2 Prolander Tournament, Brazil Fortress Halloween 2018, Memes vs Machines, TFArena 6v6 Arena Mode Cup, and a medal for participating in Copenhagen Games

- Updated tournament medals include the removal of "Medal" from the Copenhagen Games Staff Medal's name, descriptions for UDL Spring Cup, Asia BBall Cup medals are no longer "Asian", and Palaise Limitless 6v6 medals now have descriptions.

- [url=https://github.com/SteamDatabase/GameTracking-TF2/commit/2bd7f7c59e8c4e16e296c7b3511b07f6a3d8dec2]There isn't much else otherwise[/url]

- Size is ~30 MB