they seem to be the OP "easy" army. They're powerfull in casual games and annoyingly OP to play against for fun as they have everything. But not all that great for competitive play as their simplicity means they don't have any amazing combo's to really crush anything.
Skinks stay the same points but have lost their max unit discount and are only battleline for seraphon.
It actually looks like Saurus warriors are Battleline (from the leaked GHB18 pics) Saurus Guard, Knights and Skinks are also battleline if you take Seraphon allegiance