Blizzard has been deploying beta patches at a record pace, which has a lot of stale info being bandied about as fact. The official Mists of Pandaria talent calculator is wildly out of date, and much of the commentary made over the past week is now superannuated. The developers haven't been shying away from making major class changes in these early days of the beta, and so everything is still up in the air.
What we do know for sure is that there's work being done to modify our holy AoE arsenals specifically. First, Holy Radiance still generates holy power points for us. The holy power generation mechanic was moved from Tower of Radiance and placed directly onto Holy Radiance itself. Other than that, every other piece of our holy toolkit has been updated, and for the better.