It's rumored that Canon's next announcement date will be August 14, 2015. Canon will announce a DSLR camera body and two lenses at that time.
Which DSLR and lenses is unknown at the time of writing this.
We don't expect to see an EOS 5D Mark IV at this time. It could be something like the EOS Rebel SL2, or the EOS-1D X Mark II.
As for the lenses, The EF 35mm f/1.4L II has been heavily rumored as being complete and ready for production. If an L is announced, I'd expect a non L EF/EF-S lens to get announced as well.
More to come…