There's a new paper in JAMA that reports on a study (N = 630,000) in British Columbia to compare the rates of the onset of diabetes between patients that have been infected with COVID-19 and those that haven't.
For women, the results didn't achieve significance. For men, it looks like contracting COVID-19 increases the risk of developing diabetes by about 22%. (The risk is potentially reduced by being vaccinated)
The current estimate is that COVID-19 will raise the overall incidence of diabetes in the populace by about 3%.
Link to the full paper in JAMA : https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2803938