First of all, excellent animation, really well done. I love it.
I think the balanse of set 2 depends on what kind of change is done on the cards.
As far as I know, what you see in that website is the original version of the cards,
and later on the Japanese made some changes to some of the cards at around set 8
(I need to dig around for that page)
and of course, due to the change to will 'o wisp, there would be some other changes as well,
so we are not certain until tomorrow.
Anyway, after some discussion with players of the Japanese version, it seems that the balance
is like this:
Refess becomes more and more hardy, by having counter skill that increase DF, and chaning some units'
+DF skill from auto skill to start skill.
Lawtia becomes.... Lawtia, I guess. More Lycanthropes, more cards that set unit stats, more cards that
do damages to either side...
Gowen is still the power sphere, with some cards that gives you unrivaled AT(ignition). Also, pixies...
Falkow becomes harder to use than all other spheres, not because a lack of power, but because some
of their best combos requires rare cards. As far as I know at least 2 new mechanics will be exclusive to
Falkow cards in later expansions.