Motor dimensions and other requirements...

Hi! I have some questions about a battery-electric powertrain in cars...

For a compact car beyond 2020, with a target dry weight of about 1000kg, what motor would be required to balance highway performance, cost and size? would a twin motor be more practical?
What would the spec and approximate dimensions be in each case?
What would the dimensions of the controller be?

I understand these are very specific questions, so if you could point me out to other resources that might have an answer that would be great too!

Thanks!
Carthik