This already in game?
- Providing additional ways for WvW players to earn various power-progression rewards available across the game currently in PvE for participating in WvW content."
https://forum-en.gw2archive.eu/forum/pvp/wuvwuv/Upcoming-WvW-Updates/first
I believe the World XP System (WXP) is this concept. You gain special levels in WvW that allow you to spend points to make yourself better at various aspects. Carry more supply, deal more/take less damage from Guards/Mercenaries, use certain siege better, etc.
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