Aystery still shrouds the presence of Tata Motors in the US auto market. The Tata eMO concept car received a lot of attention and praise a year ago at the 2012 Detroit Auto Show as an "electric mobility study." Oh, and because it sported a $20,000 price tag and roomy interior. On the gasoline side of the ledger, the redesigned Tata Nano may or may not be available in the US within three years for under $10,000. But where does the eMO stand?