Last time they was talking about this they said the release time of v4 has been delayed indefinitivelly until they finds a replacement in 4.83 for the webkit exploit
That webkit exploit was the first step used to "breach" 4.82, and after it was used another hacks and tricks (that should be working, this additional hacks doesnt seems to be patched)
What is not working is the webkit exploit... it was like a tunnel to infiltrate inside a castle, but now the tunnel is closed in 4.83 so is needed to find another way to enter