The YouTube account Adubspyder has uploaded two videos from the filming of Michael Bay's (Pain and Gain, Bad Boys) new Transformers movie in Pontiac, Michigan - an area that recently saw a Chinese-style town erected for the same movie.The first video's description states: "Main star Mark Wahlberg in cockpit of alien ship along with other main cast members. Confirmed through binoculars." You can't make out any actors from the upload, but it's safe to assume Adubspyder is telling the truth. A green screen can be seen in the background. There is quite a colourful commentary by someone off camera throughout, so be wary of having your volume up too loud.
The second video shows "Stunt doubles for T4 in a green screened apparatus". What seems to be another alien spaceship can be seen in front of the green screen, with an American flag and bits of debris dropped behind it from 00:48 (the clip is pretty unremarkable before that).
Transformer 4 stars Mark Wahlberg (Pain and Gain), Jack Reynor (What Richard Did), Nicola Peltz (Bates Motel), Stanley Tucci (Captain America: The First Avenger), Kelsey Grammer (X-Men: The Last Stand), Sophia Myles (Underworld), Li Bingbing (Resident Evil: Retribution) and T.J. Miller (She's Out of My League), and is scheduled for a June 27th, 2014 release.