Yep. Storm Elemental Totem definitely sounds like the best choice for raiding, particularly when we're talking about single-target oriented fights. It also sounds like the best one for Brawler's Guild style soloing - and I do hope we get new Brawler's bosses for level 100, since that was definitely one of my favorite features in Mists of Pandaria. And of course I'll welcome any new elemental companion. What will this one be called, air or storm idiot? Gusting idiot? I do wonder, though, if it will either replace one of the existing elementals, or if it can be summoned simultaneously with either of the two.
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For elemental, Rainstorm sounds like the average passive talent. Very simple, no need to worry about it or think about it. One that I might consider going for if I was new to the class, or if I didn't play it as main.
If Reach of the Elements was passive for elemental, I would probably go for it in most situations, even if they nerfed its AoE effect. Exceptions would be those where I need extra burst and the Storm Elemental would come in handy. With my current talents I've tried to maximize sustained DPS over burst, which is a decision I've been rather happy with. I'd like to continue doing so with a passive talent like this one.
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