In the last few years there have been prototypes like the Yuneec. Lots of noise, then I go to Oshkosh this year and Yuneec has a cheap stall selling electric skateboards and one guy admits they don't know if the plane is going ahead .
The trend seems to be noise then run out of steam! So I am not hopeful as I am not sure we are advancing or if everyone just reinvents a similar prototype, finds it hard, then stops.
There was no electric theme at Oshkosh except two guys with home built ones, hidden away in the ultralight area.