After reading all the replies all i have to say to those who say no is "ewwwwww".
Team preview will finally give this pvp the balance it needs,and no more loses by surprise Pokes, if you are the best you will win, and after all Pokemon is a strategy game, and without team preview you have no strategy untill your opponent reveals all his Pokes (if you still have alive all ur pokes too).
I really don't get it when I see these people saying team preview is bad, I can't see where this is bad, I only assume that the only way to win for these people is surprise, and pokemon is not a surprise game it's a strategy game, so if you don't know how to play this game with strategy you are not good enough.
To end, yeah team preview would make me play again PvP without thinking "omg i have to take pen & letter and start writting down teams again" or "where in the world is this guys team i can't find it" for me no team preview is really stressfull and takes off at least 50% of the fun, so yeah i would love to see team preview in an upcoming update.
So it's a big YES by me, add it make us happy. :heart: