Anyone know much about the efficacy of the flu part of it?

A full cohort study would have to be made to attest to that. But guessing from the efficacies of the corona vax, probably not a drastic difference.

is this the revolutionary flu shot that takes us out of the yearly flu vaccine rat race or not that far yet?

Not a chance. As the flu virus mutates every so often, new vaccines will have to be made to adapt to the current epidemiology. It is a circular race.