Our usual source of undeclared CS:GO information, wickedplayer494, has found some new and interesting icons laying in the Counter-Strike: Global Offensive game files which we could see added in upcoming updates. While the information is always interesting to examine, it is always wise to remember that these could just be Valve testing things out with any actual plan for release.
If you take a closer look at the icons you will notice the new ones are highlighted in green. At the bottom left box you should notice a silenced MP5 variant. Over in the knife section, we can see there is at least one new knife icon, or possibly two. Whether this is just a single knife with two different skins in testing is unknown at this point.
To save some time I extracted the new knives and MP5 icons and threw them onto an image.
The first knife reminds me of a standard tactical knife, similar to the huntsman but smaller. The knife icon also reveals that there is a hook at the tip just like the gut knife. So here are two similar tactical knifes I found laying around the web.
You can find these icons using Adobe Flash Professional or Animate. If you have that, then head to your steam directory \steamapps\common\Counter-Strike Global Offensive\csgo\resource\flash\ and open the iconlib.swf file. You can also use a player free program called Swiff Player.
While the MP5 has been around for a long time, only Valve know if and when we will actually receive such an iconic weapon.
Another Reddit user by the name of KordGamer also found a new operation map group and, using a Flash decompiler there, we are able to pull up an image and some details on the maps.
With a simple search, you might start to remember a few of them floating around the workshop, for example de_lite which reminds me of the close quarter 1.6 battles from years ago.
Remember to take all this information with a grain of salt; Valve have been known to throw things into game files and let them stew for years. On the other end of the spectrum it could be planned for release soon, with a new operation.