The rumors are reported by Northlight Images.
About the EOS 7D Mark II they report that two different dealer sources said that
[...] the 7D2 is being actively positioned against an upcoming D400 from Nikon and will be announced around the same time along with new lenses (the 50/1.4 should join the new range of IS primes for example)
Yes, and there should be soon a new 50mm f/1.4 lens with added image stabilization. The actual one (which still is an outstanding lens) dates back to 1993. NL writes
As part of Canon's revamp of their prime lens range, expect a replacement for the [...] 50/1.4, with added image stabilisation next year