Last week, Tesla founder Elon Musk sent out a cryptic tweet about unveiling the ‘D’ on October 9. Since then, there’s been a flurry of speculation and hints about what Musk will unveil.

Here’s a list of what we know so far:

  • Tesla Motor Club member Adelman posted a picture of the back end of a Tesla S with new branding: P85D.
  • A number of tech writers speculate that the D may stand for “Dual Sport,” or two engines, giving it all-wheel-drive capabilities. Elon Musk said in February that an AWD Tesla S should be available in 2015, according to Gas2org.
  • In an interview with Walter Isaacson at Vanity Fair’s New Establishment summit, Musk hinted to audience members, “One of the things is already there, and people just don’t realize it.”
  • The vehicle could go 0 to 60 MPH in under three seconds, Seth Weintraub is saying.
  • Tesla has already promised consumers an AWD SUV called the Model X, which may be the ‘something else’  Musk was referring to.
  • Or, Tesla may be unveiling new features that enable computer controlled driving, which would be Tesla’s first move into automated driving. That’s what both Bloomberg and the Wall Street Journal are reporting.

Tesla will make its announcement tonight at the Hawthorne airport in L.A. Stay tuned for more.