It seems Sideswipe returns for Transformers 4. At least judging by these pictures, taken by RenaissanceWade, of a maybe 2014 Chevy Concept Corvette were taken near the GM Delta Township Plant in Lansing, MI where TF4 was filming over the weekend. I assume Corvette and Sideswipe since it looks like an updated version of the 2012 Chevy Corvette Centennial convertible that was his alt mode in Transformers: Dark of the Moon. A sweet ride that goes with the other ultra expensive sports cars that make up most of the Autobot fleet. Thanks to @joshc167 for the link.

Update: From the comments and twitter, readers are saying the car is either a 2002 Cadillac Cien Concept, a car that Michael Bay used in The Island. Others are saying its 2014 Cadillac Cien Concept. Which year could be important as I doubt Sideswipe would be a 2002 but could see him as a 2014. Of course neither always remains a strong option. Its just hard to ignore it being a near identical shape and color as DOTM vehicle. It would fit the character the same way the other vehicle changes still match the overall expected look for the character's vehicle mode.