The E80 is not that different to a G70 with the latest operating system.

All of the new E80 styles are available for G70 and some people would still prefer 76 keys and a few less sounds, rather than the E80's 61 keys and some newer sounds.

Roland are certain to have a 76 key flagship in the pipeline, I suppose it will only be released when the G70 stops selling as well as it does.