well I decided to wait, primarily because I don't absolutely need a new car now, I just would like one now!
"In its efforts to come up with a car that blends economy, low emissions and performance at an affordable price, Toyota has decided to use a lean-burn 1.8-litre turbo engine. Meanwhile, the THS-II hybrid system will be upgraded with efficient lithium ion batteries, which will allow the electric motor to deliver greater performance because the cells recharge quickly and hold more power for longer. To further improve efficiency, it's also **thought** that Toyota is considering a plug-in system, similar to that used on the Amberjac Projects Prius.
http://www.autoexpress.co.uk/news/au...rbo_boost.html
Yes I know that Toyota has supposedly refuted any claims that it iwill offer a plug-in, but I dare say if any other manufacturer enter the fray with a plug-in (GM rumours say they are but that seems a stretch), then all bets are off and the Prius may very well have to get a plug if they want to maintain Hybrid leader role.
It's all speculation at this point of course!
My suggestion is if you can wait, then wait for the new Lithium battery technology next model series, it's a big purchase and you will likely want to keep it for a while. OTOH, if you can't wait, get a car now and be prepared to suffer some techno-envy when the next version models do come out!
Good luck.