According to a recent report from The Detroit News, General Motors is moving forward with plans to produce electric variants of the GMC Sierra, Cadillac Escalade, and Hummer all out of its Detroit-Hamtramck manufacturing facility.
The news came from LMC Automotive, which is a company that forecasts automotive industry plans by gathering inside information and intel from the industry. At this point, it's all but confirmed that substantial investments and plans are underway. Now, it's just a matter of time.
Keep in mind that GM already made it official that over 20 EVs are on the way. However, its original timeline seems to have been pushed back indefinitely.