PJ, there isn't any data demonstrating that in the U.S. yet, but vaccinated people do appear just as likely as unvaccinated people to catch and transmit the new strain. Honestly, it's basically a different virus, and they really should rename the strain to avoid confusion. Prior antibodies don't neutralize it, it isn't nearly as aggressive, and many of the weird effects aren't happening at anywhere close to the prior rate (MIS, cytokine storm, lung inflammation, loss of smell).
However, data from other highly vaccinated countries (see: Israel) is quite alarming. In some cases, it appears that more boosters actually has an opposite effect on protection. Very strange. There has been a theory proposed of "numbing" the immune system/T cells.