Via [url=https://blog.counter-strike.net/index.php/2019/12/27283/]the CS:GO blog[/url]:

[quote=Valve][ MISC ]
– It started snowing and the winter season fun begins which includes snowballs, festive chickens, and freeze frame holiday borders.
– Added 2020 Service Medal to be awarded for outstanding service and achievement starting from January 1, 2020 GMT.
– Adjusted weights on several end of match accolades.
– Removed a sound debug command.

[ MAPS ]
– Updated nav mesh for Office to prevent bots sometimes getting stuck.
– Updated Jungle.[/quote]

Rumor has it:

- A peek at each level of the 2020 Service Medal: [url=https://raw.githubusercontent.com/SteamDatabase/GameTracking-CSGO/8ce0d64afe16452cac2e2f47abfbd2c9fc74c408/csgo/pak01_dir/resource/flash/econ/status_icons/service_medal_2020_lvl1_large.png]1[/url], [url=https://raw.githubusercontent.com/SteamDatabase/GameTracking-CSGO/8ce0d64afe16452cac2e2f47abfbd2c9fc74c408/csgo/pak01_dir/resource/flash/econ/status_icons/service_medal_2020_lvl2_large.png]2[/url], [url=https://raw.githubusercontent.com/SteamDatabase/GameTracking-CSGO/8ce0d64afe16452cac2e2f47abfbd2c9fc74c408/csgo/pak01_dir/resource/flash/econ/status_icons/service_medal_2020_lvl3_large.png]3[/url], [url=https://raw.githubusercontent.com/SteamDatabase/GameTracking-CSGO/8ce0d64afe16452cac2e2f47abfbd2c9fc74c408/csgo/pak01_dir/resource/flash/econ/status_icons/service_medal_2020_lvl4_large.png]4[/url], [url=https://raw.githubusercontent.com/SteamDatabase/GameTracking-CSGO/8ce0d64afe16452cac2e2f47abfbd2c9fc74c408/csgo/pak01_dir/resource/flash/econ/status_icons/service_medal_2020_lvl5_large.png]5[/url], and [url=https://raw.githubusercontent.com/SteamDatabase/GameTracking-CSGO/8ce0d64afe16452cac2e2f47abfbd2c9fc74c408/csgo/pak01_dir/resource/flash/econ/status_icons/service_medal_2020_lvl6_large.png]6[/url]
- As the name should imply, it is not 2020 yet. Once the 2019 calendar is thrown out in London(, England), AKA UTC, then you'll be able to claim it

- If you guessed that the removed sound debug command was snd_debug_sleep, /u/FuneralChris says [url=https://www.reddit.com/r/GlobalOffensive/comments/e8jkmd/counterstrike_global_offensive_update_for_12919/facmd56/]it is indeed[/url]. As well, a couple of Guardian-related cvars were added, and if the main menu snow bothers you, just add "+sv_holiday_mode 0" to launch options

- The rest of this one consists of [url=https://github.com/SteamDatabase/GameTracking-CSGO/commit/8ce0d64afe16452cac2e2f47abfbd2c9fc74c408]localization file updates[/url], which are made possible in part by the contributions of [url=https://translation.steampowered.com/]Translators Like You - Thank You[/url]

- Size is close to 110 MB