Normal avatars only. Because each avatar costs 400 gold and 3000 silver, which is the same as those avatars inside Candy World Pack and The Blind Disciple Pack.
They didn't mention about Limited or Holiday Edition avatars. Anyway, Holiday Edition avatar usually costs 420 gold, 3500 silver.
Christmas Pack Special / Xmas Party Pack description is the same as Candy World Pack, The Blind Disciple Pack, Elder Series, Rise of the Neutrals Pack, Iron Legion Pack, Hellforged Pack, Rise of Ra, The Black Legion, Runic Shift Pack, Rise of Clockwerk series...