Hello there!
In regards to Stats, sadly i can give you a straight answer with full confidence.
No one is really talking about the SPR changes other then speculating about it.
The formulas on the Summons skills dont say anything about INT or SPR so its hard to say.
If SPR works as an addition to the damage formula then we will have to test it first.
Your other Skills will still scale with your Magic Attack, meaning INT will still be important.
First thing tomorrow, i will test how effective SPR is for a Necromancer and its summons, the moment i have all my testing done, i’ll either add a new video to the thread explaining things or simply redo the Necromancer Guide.
You should have an answer during the day, so keep an eye for updates!
Depending on how SPR is gonna impact your summons, the stat priority will be personal choice.
If you want your summons to carry your damage then go heavy SPR.
If you want your Flesh Cannon, Flesh Strike, Flesh Hoop to carry your damage then go INT.
If you want the best of both worlds, then i would say around 80 CON then even INT / SPR.
But like i said, ill know for sure tomorrow and soon as i can ill let you guys know 
As far as skill tree goes, same argument, ill have to see if Linker is still fine or if we will have to resort to something else.
Again the moment i test this out, ill let you know straight away
But if you want a replacement, think about something like:
Wiz3 > Thauma2 > Necro3 Same thing as Link, except no CC but some added damage from Thauma.
Wiz1 > Cryo3 > Sorc1 > Necro3 Lots of utility and CC, 2 extra minions.
Wiz1 > Cryo3 > Kino1 > Necro3 Same as the above but swap 2 minions for the Cryo+Kino Ice Wall combo.
Well have to wait to be sure of everything
just isn’t the same without old pyro. Also ty biscuit for trying other stuff also!