Just on this general topic I have been mulling over getting an electric car at some point or, possibly, a hybrid.
But you realise, if you are a Jazz owner, what you'd be missing out on. We've talked about the flexible and convenient load carrying aspect but there are no other small cars with such a huge cabin. The legroom in the back is fantastic even with the front seats pushed all the way back (and even as 6 footer I don't need to do that).
There is a Toyota dealer opposite me and I had a look round a Yaris hybrid last week. Not bad but the boot was tiny, the rear leg room wasn't that great and the front seats weren't as supportive as those on the Jazz. My mate has a 66 plate Fiesta with the 1.0 litre eco boost engine. Bit more get up and go than the Jazz and definitely more composed on bendy roads but tiny boot, seats don't fold flat and the leg room in the back isn't great.
If they add a hybrid to the current range, then, along with the 1.3 engine and the new 1.5, they will have a formidable lineup.