Zero have announced a new range for 2013, with some quite marked improvements compared to the current range. https://www.zeromotorcycles.com/uk/2013
The street model, Zero S, improves capacity from 9kWh to 11.4kWh, which extends range from 114/63 to 137/70 city/highway at 550mpge The top speed is pushed up to 95mph from 88mph with a 54hp engine.
Bad news is the cost goes from GBP11,750 to GBP13,500, quite a marked jump. Just like cars, electric bikes almost look mature, the feats in TT zero are certainly fairly impressive and show what might be capable. The performance of this new announcment looks quite good, it's a shame the increase in battery capacity (26%) wasnt matched by an increase in range (a good 20% city, but only an extra 10% highway).
Thinking about my commute, it's 30 miles each way, and mostly on highway, so 70 mile range is a bit close, and is a bit short for leisure riding.
For commuting, i do like the idea of being able to plug in and trickle charge overnight, effectively never having to 'fill up'.
However, besides the range anxiety, the price is quite substantial, you could have a fireblade for that money with 2k left over. If you purchase it under the guise of saving fuel money, my calculations put the break even mark at about 180,000km!.
I think its awesome to see this tech starting to mature, but its not quite competitive yet. I hope to keep my CBR for a few years, but i also hope that should i decide trade up in say '14/'15, electric might just about be ready enough to entice me!