DA is already proccing for each target on live, if the heal crits. The tooltip indicates something totally different.
- Significant update to Prayer of Healing (more base heal + DA can proc for each target)
"and all heals from Prayer of Healing"(Cataclysm Beta Patch (Build 13277) - The Wowhead Blog) basically means, that it doesn't matter if you crit-healed or not. Prayer of Healing now ALWAYS procs Divine Aegis. This change is a 20-45% (depending on crit and mastery) buff to Prayer of Healing for Disciplin.
I can't wait to get my fingers on some logs.