All PC players should be aware of this. I'm getting on console so less of an issue if it isn't fixed. It could be fixed by release, but we're also talking Ubisoft.
I had one encounter with a cheater. The guy was invisible and instant killing people. But its a minor issue. Its a beta, there is absolutely no cheat prevention and people on the PS4 were also cheating according to the reddit posts.
Also it's ubisoft... their view on anti cheating has always been lax. I imagine we get some form of anti cheat but there is almost a guarantee that there will always be cheaters no matter what platform you are on.