Entertainment Tonight has posted a report from the Detroit set of Transformers: Age of Extinction when the crew was filming on the "China set" built in the middle of Detroit, Michigan in first week of August (vids: here, here and here). The video has quick comments from Mark Wahlberg, Jack Reynor, and Nicola Peltz (inexplicably asked her relationship status) with cameo from Michael Bay. The reporter, while sitting in the Pagani Huayra, (SPOILER) referred to it as Stinger which is a name that has popped up as a potential character name. I wouldn't call this official confirmation but darn close as I doubt the host (reporter is too strong a word) knows anything about Transformers except what is fed to her by the producer speaking in her earpiece.

Update: Correction to title, removed the reference to "Autobot". As pointed out in the comments, the faction remains unconfirmed. The toy list references "Stinger" of various classes but saw no faction reference but the vehicle has been mostly hanging with known Autobot vehicles during filming.