Two new variants of the Prius are on the way along with a new all-electric car likely based on the Toyota iQ.

Toyota is developing three new green models, according to a report by Automotive News.

The models are scheduled to be introduced in 2012. But not all three are entirely new or all-electric vehicles.

According to an anonymous source for Automotive News, there will be a new plug-in variant of the Prius as well as another Prius version of an unspecified type. Also there will be a new, all-electric vehicle. All three models are set to make it to U.S. dealer showrooms by the first half of 2012.

Toyota plans to expand the Prius range into a series of vehicles that are almost a sub-brand, although Prius' will still remain badged as Toyotas. The battery-powered car will likely be based on the Toyota iQ - a compact, city-car model Toyota introduced in 2008.

The report also states that the new electric car will only be sold in markets where the infrastructure is supportive of battery-powered vehicles. It's not clear whether that means different countries or that it will only be sold in certain part of the United States.

There will also be a viral marketing campaign ahead of the introduction of the three models, likely to highlight their green-car credentials.

Toyota to launch three all-new green vehicles in 2012