It’s unknown when the program’s beta phase will end. PTCGO will be retired and replaced with it when this happens.
You have the option of migrating your existing PTCGO account to PTCG Live, but it’s currently not mandatory. The transfer is a one-way trip. You must not migrate your account if you’re currently participating in the Team Challenge.
PTCG Live was originally supposed to release in 2021, but was delayed. The beta was first released in Canada in February 2022, then expanded to other countries over the course of the year. This was in an effort to test the beta before rolling it out to larger markets like the United States.