Legion PvP Guides   I use a Google Alert to send me new potential links on a daily basis.

Skill Capped: the forums are free; the videos will cost you $24 for a 6 month subscription. Here’s the link to the articles on talent choices.

Arena Junkies class discussion: good information and jackwagons.

PvP Leaderboard: See which talents, glyphs, stats, and gear top WoW PvPers are selecting.

ArenaMate: A good way to track the current rating needed for the various titles (e.g. Challenger) in arena and RBGs. Also has the current ladder of top rated players.