Many thanks to @Archmoco who has tweeted that they are on set filming in Long Beach. It looks like they are shooting a video of some sort to promote the new KRGT-1 bike. They have included a photo with the tweet.
Keanu was most likely talking to the colorist about this footage.
Update: Many thanks to tgfilms who has posted several photos on webstagram. You can see them here, here and here (from yesterday).
Also thanks to sammylou2ky who shared a photo on webstagram along with a comment that Keanu let her friend who works at Arch Motorcycle drive his new bike a while back. She also said Keanu was down to earth.