Toyota unveiled long-expected additions of a wagon and plug-in to the Prius line, but added this: a smaller Prius C concept, for a production model Toyota says will top fuel economy rankings when it goes on sale next year.

The Prius C steers away from the please-everyone approach of the current Prius, aiming for the footprint of compacts and subcompacts. Toyota didn't reveal prices or full specs of the production version, but said it would be targeted at young urban couples who want maximum fuel efficiency. The current title-holder of most efficient hybrid is the regular midsize Prius at 51 mpg city/48 mpg highway.

2012 will also be the year Toyota launches its plug-in version of the regular Prius, sporting a short 13-mile all-electric range. The Prius V (or Prius Grande), arriving later this year, adds a few extra cubic feet of cargo space in back while getting 42 mpg city/38 mpg highway, all an attempt to broaden the range and capitalize on what could be a few years of rising gas prices.