The "Mustang inspired" electric SUV is scheduled to be revealed in November and go on sale some time (late, I expect) in 2020. It looks like it will have a pony badge on the nose, which I'm not happy about.
There will be an S550/S650 hybrid Mustang and this is expected to have a V8 coupled with electric motors, possible powering the front wheels. When we'll see this isn't known yet, but possible for the '21 or '22 model year.