Via [url=http://blog.counter-strike.net/index.php/2016/01/13509/]the CS:GO blog[/url]:

[quote=Valve][GRAPHICS]
– Updated sticker inspect glove model.
– Fixed certain video options not getting applied immediately when user changed them during a match.
– Fixed some cases where updated glove models interpenetrated weapon models.
[SOUND]
– Fixed bug that caused some weapons to sound quieter than intended.
– Minor sound mix changes.
[LINUX]
– Fixed a regression where small mouse movements could be ignored.[/quote]

Rumor has it:

- Size is ~10 MB