Toyota Motor Sales U.S.A. Inc.'s Scion brand unveils the iQ concept, but the youth-oriented nameplate's top executive says it would take at least a year to turn it into a production entry for the emerging micro-subcompact-car segment.

“This could drive off the stage,” Jack Hollis, vice-president-Scion, says of the concept model.

“We are still looking at it from a concept standpoint. But we'd love to see Scion expand from the current three products, and this might be the way to go,” he tells Ward's after the iQ concept's auto show debut.

The iQ would represent a long-discussed fourth vehicle for the brand's lineup, which now consists of the xD subcompact, boxy xB cross/utility vehicle and tC sport coupe.