> Detroit debuts: The dual-motor, all-wheel-drive version of the Model S, which bears the letter 'D' on its badge, will debut in Detroit, three months after its unveiling at a private event in Los Angeles.
> Pipeline: The top-of-the-line awd Model S, the P85D, is on the way to dealerships. Tesla is putting finishing touches on its Model X crossover and plans to start deliveries this fall, after several delays.
> New faces: Tesla hired Nissan-Renault spokesman Simon Sproule last spring as its communications chief, but Sproule quickly left to become chief marketing officer at Aston Martin. In November, Tesla rehired former communications chief Ricardo Reyes, who had left in 2012 to work at payment startup Square.
> 2014 share: 0.2 percent (Jan.-Nov.); 0.1 percent (Jan.-Dec. 2013)
> Sales trend: Tesla said in late 2014 that it was on track to deliver 33,000 units of the Model S worldwide in 2014, a 50 percent increase. Most of those cars were sold in the U.S. through Tesla's factory-owned showrooms or over the Internet.
> Challenges: Tesla has struggled to ramp up production quickly enough to meet demand. Its greater ambitions hinge on the mass-market Model III scheduled to go on sale in 2017, and that product's economics rely on another manufacturing gamble: the battery "gigafactory" under construction in Nevada.
> Strategy: Tesla plans to constantly update the Model S and Model X with wireless software updates and new variants to keep them fresh and interesting until it can launch CEO Elon Musk's real dream car: a mass-market electric vehicle.