I didn't see anything in the faqs post that mentioned if there was Pve and pvp gear or a specific pvp stat. Will all gear be used for pvp? Or just like wow and now most other mmos will there be specific pvp gear that has a stat that is only for pvp?
Structured PvP gear is only usable in structured PvP.
PvE gear can be used in WvW and gear bought in WvW can be used in PvE.
There is no pvp specific stat in this game, but you can alter your gear with runes that provide increases to certain stats relative to the build you are using.
In Structured PvP you are level 80 all the time. In WvW you are bolstered to level 80 which helps, but a true level 80 will be better. In PvE you gain levels starting at level 1 and working your way to 80, but you are down scaled to the content around you so if you were level 40 and roaming through a level 20 area you would be down scaled to level 20. Which is nice because you can never out level your friends and can also go back to help them level even at 80.