IMHO this imminent DLC should have not be limited to Northern Pagans but to all Pagans, simply they use a Viking (or maybe is a Dwarf, so we get a Dwarf invasion, maybe) as they're the better to symbolize all the pagan world.
(Yeah they could use a Zulu with painted face and a bone in his nose but, admittedly, he would not have the same effect).
So I hope to see Tengrism (this could implicate playable hordes maybe?), Baltic Pagans, Zoroastrianism and optionally African paganism too... maybe adding something in those "no character" areas in North Africa.
In the end the basic mechanic is the same... more that one goodness, sacrifices, tribes and so on... ahh yes and Catholics/Islamic that Holy war you all times!
Do you want to pay to have Asuratsu Religion, then to pay to add Tengri and so on? Really?
I will not...
P.S. I'm unsure if is correct to use the term "pagan" referring to Zoroastrianism in the end is a monotheistic religion in some way (oh well in some way Ahriman was a goodness, too) and the "secret" father of Judaism, Catholicism and Islam... Zoroastrianism and Persia are so huge and different to generic "pagans" that it deserves a dedicated DLC perhaps...