> If you are familiar, how confident are you that it won't be an issue with the current vaccines, and for what reasons?

I'm extremely confident, because we already have population-scale data on the matter. All evidence points to the vaccines producing marked reductions in infection rates and virtually eliminating severe cases and hospitalizations. It's difficult to even find any cases of vaccinated COVID patients getting severe infections.

Antibody-dependent enhancement of corona viruses was a concern before we had data, but it was taken into account in the risk evaluation process like every other well-known factor in vaccine research.