That said the other two branches, machine empire and genetic perfection, have yet to receive quite as much attention in teasers, and we won't be seeing any new stuff on either of them in next weeks dev diary either it seems, but I am fully expecting them to have as much new and interesting content and mechanics as psionics.
Based on what I saw already, the genetic path will give you a ton of Trait points and massive reduction to the GE cost/pop.
I think the costs were increased to thier current - rather extreme - level in preparation for that.
As such it would give you the most Freedom to choose your direction and you could even choose if is pop or leader focussed.
Psionics seems to be clearly leader Focussed.
Robot Upload empire would propably be Pop focussed. Switching from food to power. Adding all the bonuses for being an AI. It would at least have immortal leaders too, but propably with less bonus for the leaders. In effect you get "absolutely save AI bonuses".
Just hoping for massive boosts to science and more awesome technologies to research to destroy the space psychics.
I asume at least adding the "Mechanical" trait to your pops. On top of the already existing traits. Could put you somewhere in the +40% for anything but food.
Immortal for Leaders has been confirmed already.
Megastructures AP lets you build science nexus (nexi?) to do just that.
I am not so sure that would be a viable option. Afaik Habitats and the Ascension chain all need the 2nd and 4th AP-Slot. You could in theory save the points (it is the 2nd slot open, not the 1st one in use). But that would mean not using a lot of the other options.
It would be viable if you are a tall Robot ascension empire. But for something (propably) highly pop focussed, you want to go wide to reap the most benefits.