Updated from 11:03 a.m. to include comments from Edmunds.com editor in the eighth paragraph.

NEW YORK (TheStreet) –– Tesla (TSLA) CEO Elon Musk continues to set the world of tech, media, automakers and the investment community ablaze, as the enigmatic leader unveiled that Tesla has more to show off than is currently known.

Musk, who has previously hinted that the Palo Alto, Calif.-based Tesla was "not currently showing all our cards," took to Twitter Wednesday night to announce an event for Oct. 9 to unveil something he referred to as the "D and something else."

The initial tweet took on a life of its own, with Internet commentators making jokes about Musk's choice of phrasing, which prompted a response from the effervescent billionaire.

Speculation abounds about what the D could be referring to, though most are anticipating a previously unannounced vehicle to go along with the company's Model S and the upcoming Model X. The company is also set to unveil a third-generation car, dubbed the Model E, in 2017, but Musk has previously hinted that the third-generation could include another SUV, smaller than the Model X.

"I think the "D" could be some sort of truck or van," said Karl Brauer, senior analyst at Kelley Blue Book's KBB.com. We've already seen a sportscar, luxury sedan, SUV and entry-luxury sedan from Tesla. There were rumblings he wanted to do a truck several months ago, and of course that market, along with the van market, is extremely active right now."

Shares of Tesla were rising sharply in early Thursday trading, gaining 2.6% to $246.60 on back of the tweet.

Mark Takahashi, editor at Edmunds.com, believes it's possible that Musk and Tesla are going to show off their entry level car. "Odds are it's going to be their entry level coupe," Takahashi said in a phone interview. "He did give out an overreaching timeline on the Model X, and then their entry level coupe, and then the pick up truck. It's not the pick up truck.
My guess is it's going to be that entry level coupe."

Musk has been a master at using social media to promote Tesla and SpaceX, the space transport company he founded. This is just another example of Musk's ability to whet the appetites of those interested in the company and where it goes from here.

--Written by Chris Ciaccia in New York

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