Via the Steam Community:
Valve- Added missing string for the PNG filter when using the Decal Tool
- Added missing newline to the 'Unable to initialize sound capture' console message
- Added IsNextBot() method (GitHub fix from Bitl)
- Added support for custom mission briefings in vsh and zi game modes (GitHub fix from Gamer_X)
- Added convar to control max Mann vs. Machine robots (GitHub fix from ficool2)
- Added prediction for Thermal Thruster + self-stun (GitHub fix from wgetJane)
- Fixed crash with game_round_win in KOTH (GitHub fix from doclic)
- Fixed Mann vs. Machine status HUD not using the mini boss background for enemies in the Support group
- Fixed Medieval Mode Auto-RP not matching lowercase input unless it begins with an 'a'
- Fixed backpack page buttons putting the 'New' label behind the button
- Fixed character info panel not being positioned correctly
- Fixed The Front Runner using the wrong team color for the headset on the Stylin' style
- Fixed Announcer VO with static at the end of the sound (community fix from Lindon)
- Fixed missing lightwarp setting for the Conniver's Kunai and The Half-Zatoichi (community fix from Lindon)
- Fixed The Bazaar Bargain's scope being painted when using the Elfin Enamel war paint
- Fixed commentary text not displaying
- Fixed TFBot VScript methods SetBehaviorFlag, ClearBehaviorFlag, IsBehaviorFlagSet, SetMission, SetPrevMission, GetMission, GetPrevMission, and HasMission using 'unsigned int' by mistake
- Fixed overlapping internal font names causing one font to overwrite the other for Linux clients (GitHub fix from RoseyLemonz)
- Fixed Casual late-joiners seeing Competitive logo on Match Status HUD doors (GitHub fix from rabscootle)
- Fixed Spy bots using human voice lines in Mann vs. Machine (GitHub fix from John Kvalevog)
- Fixed crash on VGUI menu bar button cursor entrance (GitHub fix from RGBACatlord)
- Fixed Mann vs. Machine bomb carrier voice line playing during normal CTF with bots (GitHub fix from mastercoms)
- Fixed organ props spawning from non-Vita-Saw damage (GitHub fix from Thomas Kain)
- Fixed uninitialized field use in CParticleEffectBinding (GitHub fix from Thomas Kain)
- Fixed type cast warning caused by pointer size mismatch (GitHub fix from SanyaSho)
- Fixed typo in Mann vs. Machine score calculation (GitHub fix from HalfMatt)
- Fixed missed break in logging character field save data causing incorrect logging (GitHub fix from Dmitry Tsarevich)
- Fixed Engineer bots soft locking on CTF maps (GitHub fix from AwfulRanger)
- Fixed middle mouse kicking you in PASS Time (GitHub fix from ficool2)
- Fixed radial fog not being enabled in 3D sky on official maps (GitHub fix from ficool2)
- Fixed PLAYER_FLAG_BITS truncating m_fFlags sent to clients (GitHub fix from copperpixel)
- Fixed prediction for jumping when The Huntsman is charged/released (GitHub fix from wgetJane)
- Fixed prediction for Force-A-Nature jumps (GitHub fix from wgetJane)
- Increased PLAYER_FLAG_BITS to 32
- Removed temporary player jingle files if tf_delete_temp_files (GitHub fix from AndrewBetson)
- Removed MFC dependency in the launcher exe (GitHub fix from Slartibarty)
- Updated the ConTracker 'Back' button to accommodate longer localization strings
- Updated plr_hacksaw_event
- Fixed erroneous and asymmetric clipping across the map
- Fixed pumpkin bomb quota being too low
Rumor has it:
- Size is ~115 MB