There's no Flux v2 on the market yet, so I don't believe anyone can answer your question.
If I remember correctly Poseidon Watersports (or Foiling magazine) has tested both wings you mention.

zarb said..
Flow feels fine. Well balanced. Surprisingly find myself liking the Fly more than both the Flow and the Flux...
Rumor is that the new Flux will be dyneema, or at least have a dyneema option.

Why do you like fly more?

I have both the Flux and Flow and love them both. Ive written up pretty detailed comparisons on other threads, but the gist is that the Flux is slightly better at the top end and the Flow is better at the bottom end (grutier). The flux also has a bigger span than the flow, so the flow is slightly easier to throw around on waves and freestyle.

The Flux v2 is almost definitely going to be Aluula or Dyneema (i bet its Aluula) and I'm sure it will be quite a bit more expensive. The current Flux/Flow have a lot of overlap and I think they are trying to further differentiate the models for next year with the super premium materials and more of a bias towards freerace (vs wave/freestyle with the Flow). Latest I heard is Feb/March release.

I picked up several new toys and one was a Flow in 5.0. This is my first wing purchase in 3 years. Been riding the V1 mantis. Had it out 3 times so far in 14-18 mph wind. This would also be what I take my 5.0 mantis out in too. This thing is so easy to swing around. It feels like it has about 20% more power than the mantis. Goes upwind great. Seems like I can get better upwind angles going toe side on it. Can ride toe side with one hand at the back of the front handle. Having a blast with thing. Definitely a great purchase.

Yep