Via [url=https://steamcommunity.com/games/TF2/announcements/detail/3895114040981659978]the Steam Community[/url]:

[quote=Valve]- Added missing 'No Glasses' style for The Dapper Dickens
- Added missing strings for koth_krampus
- Fixed name typo in map credits for koth_krampus
- Fixed the Wanderer's Wool not being paintable
- Updated cp_carrier to fix some visual issues
- Updated Selfless Sensation to fix a rendering/brightness problem
- Updated the Permafrost Essence Unusual effect to fix transparency issues in bright areas
- Updated pd_galleria to fix broken cube maps
- Updated pl_camber to fix a problem with RED spawn camping
- Updated pl_emerge to fix missing .nav file
- Updated cp_gravelpit_snowy to fix missing custom sounds

- Updated pl_phoenix
- Reduced Blu respawn wave time on A and C from 5 to 4
- Increased Red respawn wave time on A and C from 6 to 7
- Rollback zone on C now reduces the payload push speed by 50%
- Locked door connecting B and C now opens when A is captured instead of B
- Added a failsafe to prevent a case where the payload cart could get stuck at the base of the elevator finale
- Various visual fixes and adjustments
- Various pickup size adjustments
- Various clipping adjustments
- Performance improvements
- Updated checkpoint names[/quote]

Rumor has it:

- Size is close to 125 MB

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[b]This is the last full month that Valve will be supporting Steam on Windows 7 and Windows 8.1 [url=https://help.steampowered.com/en/faqs/view/4784-4F2B-1321-800A]before support is abandoned on 1/1/24[/url], due in part to Chromium and its Embedded Framework also abandoning these platforms.[/b] Any future TF2 updates that moves the minimum Steam client version beyond the last one available for 7/8.1 will render it unplayable unless you upgrade Windows.