I'm currently leveling a cleric in this game and was wondering how the end game content works out ...yes ex WoW player here how does the raiding / pvp differ from most end game MMORPGs or is it virtually the same

Endgame =

10 man/20 man raids

whats the pvp outlook for endgame or is there next to nothing

Warfronts, around 7 types. (Instanced PvP, 10v10, 15v15 or 20v20 max teams)
Conquest - 3 teams of 20/40/60 people fighting to control biggest part of the zone.
I have a feeling in RIFT 3.0 we will get arenas.

If you are a PvPer you won't find much for yourself to be honest. Unless you find urself a pvp guild and go premades with them.

but to be honest its actual Oki pvp content if i think bout other games beside if u look specific for arena, i dont know mutch who are on paar.
rest of ur statements are pretty on point

especially in 3.0 with all classes are being able to play all 4 roles support/dd/tank/heal