The first regards the three Nascar vehicles. Early on, depending on the website, they were referred to as Stunticons and Omnibots. Nelson says "...all I'll tell you is that they're not Stunticons or Omnibots." For lack of an alternative, I am going to continue to reference them as either the Nascar vehicles or Stunticons.
The second, referencing my theory that the "Einstein" robot spotted on the Chicago set was Kup was also rejected with "Wrong, no Kup." My next thought then was Perceptor. As Nelson put it, "Try again." At this point, I have no idea who the character is so will go with "Einstein" until a better name presents itself.
So for those mourning the loss of Kup from the movie, here is a video of the previous mentioned base jumping from Trump Tower in Chicago.
Update More from Trump Tower from Obvious Child Blog. This one shows the set at the base that has the same devasted look as the Michigan Bridge area did. Video below, click here for more images. Thanks to Josh for the link.