I remember in the shaman preview, it said Ele's would get the overload talent as a mastery and it would also effect Lava burst. I'm not seeing that on the talent calculators though...
I can't post links but the talent calculator on wowhead shows the masteries. (I don't know if the one on mmo-champ shows them)
The first two "masteries" have been scrapped for anyone. The "passive abilities" that you get when you "specialize" in your spec are to make up for those. The third Mastery, Elemental Overload for ele shamans is still there and will be increased via Mastery stat on gear.
Most of the already announced "Mastery" effects will remain the same but some might change.