Daz, the E80 is not far better than the G70, It has different interest for different players, but are basically identical except for the keys , and speakers..etc.
I have been informed already that Roland is working on a new Arranger line that will incorporate an Wav/Mp3 player..similar to a new product Roland just released[Access or something like that]..a table top unit..It is common for Roland to design their top models over a period of several years..My guess we will hear hints of the new board early next year, but won't see it till late next year or after 09 Namm.