During the 4/16 Twitter Developer Chat Chat, Zarhym released one of their “most exciting” changes to Cataclysm is a new Balance Talent called “Solar Beam”. It appears it will work like the sun beams in the Freya encounter.
“Some of the new Balance talents for druids, like Solar Beam, which works like Freya’s spell where it instantly silences a target and they have to move out of the beam to get rid of the debuff.”
Looks interesting for PVP, and perhaps for trash pack pulls in PvE, but I’m not seeing a big PvE bonus for this. But it might be a big boon for arena druids, allowing you to force healers out in the open and not LoS-ing behind a stupid box.