ok heres a list of the new heroes in GW:EN and where to get some of them!:

Ogden Stonehealer - Monk - Dwarf - Get when passing through to GW:EN
Vekk - Ele - Asura - Get when passing through to GW:EN
Gwen - Mesmer - The little girl u meet in pre!!! - get at EotN when look into the pool
Jora - Warrior - Norn - Complete "curse of the norn" quest
Kahmu - Dervish - Human - Defeat in "Norn fighting tournament"
Xandra - Ritualist - Human - Defeat in "Norn fighting tournament"

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those were unlockable in preview event but there are also the following available later on!:

Pyre Fierceshot - Ranger - Charr
Livia - Necro - Human
Anton - Sin - Human
Hayda - Paragon - Human

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For those of you who didnt notice, there is ONE hero for every profession

I will give info on their locations and how to get them as soon as i found out.