It’s here! Complete online access to Brill’s New Pauly, ancient and classical, with all the supplements! This is a restricted resource, so you need to login* to the U and the Libraries to gain access.
The link goes to the catalog record which will, in turn, link to the resource after you authenticate with your U of M login.
Supplements 1 which includes Volumes 1-6, and just released Supplements II, Vol 7.
The rest of Supplements II, Volumes 8 through 13 are pending in future years as the print is published.