Priest - learning to play after 1.10

As a level 42 dwarf priest, I am both looking forward to and am apprehensive
of the upcoming changes.

For 29 levels I struggled with a disc/holy build. Then, tired of having my
most frequent interaction as a solo player being with the spirit healer, I
succumbed to the dark side of the force.

It took me awhile to re-learn my class (there was that one unfortunate use
of psychic scream while in group). I learned to love vampiric embrace,
shadow word pain, mind blast, and mind flay. Shadowform increased my
abilities as a solo player.

Now, it is time to change.

And I am completely unnerved.

From a role-play perspective, and, looking to higher level content, I am
thinking there is nothing to match the Holy/disc spec'd dwarf priest.

But, how to get there from level 42? I need a plan! I want survivability in
solo play, and to be a necessity in groups. I want to be feared in
BattleGrounds. Currently, shadowform will add to my kills, but if I am the
only healer in the raid, I *need* to be able to heal. And currently I am one
very squishy target. Am I correct in thinking that the new talent trees will
be my answer to the multiple requirements of PvP play?

I've been playing with the talent calculator, and I feel like a kid in the
grocery story, with tons to choose from, and a limited amount to spend. I
seriously want to get the best bang for my buck.

Any theorists want to suggest a solid build for RP, PvP, and end-game?