That new line is called Transformers Alternators. I bought Smokescreen (the WRX) as soon as it came out. I'm waiting for Sideswipe (new Viper), Hound (Jeep Wrangler), and the RX8. When in car mode, they're incredibly detailed: the WRX has 4 opening doors, opening hood and trunk, and the intercooler/engine comes out to turn into a gun. The front wheels steer, and the seats inside recline. Awesome.
FYI: the 20th Anniversary Edition of Optimus Prime is out as well. He's huge, and actually has the Matrix inside of him. Very cool. He also comes with a Megatron pistol. In Japan, he's called Convoy.
You can also buy the Alternators in full die-cast metal from overseas. Search online for Takara (Hasbro's Japanese sister company), and you'll find them. Convoy can be had in die cast, as well.
I made a little gif of mine: