We usually beat priest rogue, open hard on priest rogue will usually get off your priest to come save his priest which will give you guys the advantage. Mana burn war then you innervate your priest. Once their priest is oom, your priest mcs the rogue so you can finish him off.
Have you played against Nekrolyte and Furi?
The first game they went hard on my priest and lost (peel Furi, kill him when he's out of cds).
The next two games, Furi sat on me the entire game with PvE gear doing almost unhealable damage while I literally have to kite to abolish myself the entire game to get topped off, and it seems almost impossible to win (they win the mana war even if I interrupt nearly every burn with charge/bash and we get burns off, because of his ridiculous damage forcing my priest to heal and me to run away all the time).
We've lost some games to awful priest/rogue teams who tunnel my priest when my peels don't go perfectly (I like maim dodges when I'm obviously behind the rogue on my screen, loooool), I guess I'll just forget peeling right away and start by going WotLK-mode on their priest against those.
I don't try to pounce rogues against MR or LR normally (obviously if you do get a pounce then you win, but no half-decent rogue running either of those comps should EVER eat a pounce against priest/feral). I'll actually even Faerie Fire to get in combat with the mage/warlock if I'm not confident about avoiding a sap while I open on them. Go to bear fast, if the rogue opens on my priest I immediately FC-bear him, faerie fire, and bash if I think I need to. Past that it's just living until you can kill the rogue (which is hard, but with war stomp->cyclone, fear, etc. it is possible if we don't make mistakes, against most teams).
If the rogue opens on me I'm normally already in bear and we position ourselves so that it's hard for them to cc my priest. Still easy to lose that way, because they can kill me fast, but if you force a cloak and a trinket on the rogue (faerie fire, priest dots, bash, warstomp, fear, whatever) then nature's grasp can save games (or you can use NG to force cloak, faerie fire after, and nuke the rogue with PS+barkskin+cds on you, stuff like that).