Team Fortress 2 gets a new update tomorrow called the Gun Mettle Update. To summarize, the game is taking on many ideas from its much more popular cohort, Counter-Strike: Global Offensive.
First of all, weapon skins are now a thing, complete with three different levels of wear, just like CS:GO. There is also a $6 coin that can be purchased that allows for players to undertake "missions," which are really just in-game objectives to earn weapons, just like CS:GO. It's also now possible to inspect a held weapon, just like CS:GO. And finally, players can also now pick up enemy weapons after a kill if their class can use that weapon, just like CS: GO.
That last one is a pretty significant change. No longer are players locked in to the weapon they choose at the start of a life, and can adjust playstyles on the fly. All of the balance changes are listed here, but I'll give a quick rundown. The Loch-n-Load is nerfed, the Heavy is all-around buffed, the Gunslinger is completely changed, and the Panic Attack is probably not useless now. Every class has had some significant change, so be sure to check it out!