I contacted CA Support and was advised I would not have employee access rights if my email address were changed to an HCL.com. The support rep suggested that many systems are being converted and that I should wait for notification from "management" regarding when to request the email address associated with my communities profile be changed. I'm opting to stand by for the time being and will hope for the best.
I'm just one of hundreds (thousands?) of ex-CA employees who now work for HCL and will have the same issue. I'm sure it would be greatly appreciated if any further detail regarding conversion of Communities to an HCL-branded asset and specifics regarding the email address in our profiles could be posted here and/or widely communicated.