Hacking is still possible in stable branch version.
This is a video (not mine) in which the player is able to talk to the hacker. He explains what his hack is capable of:
- speed hack
- ESP
- loot magnet hack
Just to name the most important ones.
https://www.youtube.com/watch?v=HmdICWYghRI#t=228
The two players already have contact at 2:56, but the first time when the hacker is in the video is after 3:48. The two talk German but when they talk with the hacker they talk in English. The hacker starts talking after 4:50. He explains what the hack is doing in detail.
PLEASE STOP THE HACKERS AS SOON AS POSSIBLE!
(For e.g. make it possible to report the last time you got killed and somebody is taking a look on that player if there are a certain number of reports of hacking.)