I was told by one of Salesman (last IT show), e-Pl1 is much better (in term of WB and much cheaper) than e-pl2. Sensor+AF speed are all the same. He proved it to me on the spot with all the same setting.
I read review also said that (e-pl1 better than e-pl2 in terms of picture Q).
E-pl2 win because of bigger LCD, more dots and nicers design. Price wise also "win" a lot over e-pl2.
I would rather use money to buy lens and stick to e-pl1 body.