[...] They will be very powerful (btw 1st one, for NG will be revealed on the 6th), so what's to stop me from playing a Korathi Heatwave on them R1, and denying all their future value? Will they be immune?
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Yes, which means we know who is right on Saturday (which makes for a fun game).
So we can agree these evolving cards, one per faction, will be really powerful, they are "the scenarios of this expansion".
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They are the new card type of this expansion and like how Scenarios are basically engine+artifact, these will be based on a glorified veteran tag (hopefully they are more distict, although each having an own art with premium sounds like there will be some effort put into that).
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They will probably cost 12-15 provisions each, and be very powerful.
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I am not sure about that, with Scenarios they had to put a high provision cost, because they wanted them to spawn a card each time (apart from Passiflora's chapter 2 after the rework), have immediate impact (Prologue) and be triggerable multiple times (2+), which means that you will be spawning 3+ cards, even with 4 provision cards that is insane for a single card, so they cannot be accessible with less provisions.
Evolution gives you one card, which does not necessarily spawn multiple already existing standalone cards, they could also be lower in provisions.
Given that they are intended to be "glorious" I do not expect them to be outside of 9-15 provisions though.
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Now lets go back to MoO, when it was released. Everyone was using scenarios. They were definitely worth their provisions. So everyone teched against them. Next step? Find workarounds to play 1-2 chapters of scenario immediately, to minimize risk of scenario being destroyed, and these were the scenarios that ruled.
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But Scenarios were and are inherently binary with removal existing (they are to some extend what was wrong with engines in early homecoming), that alone was responsible for what happened with Scenarios.
Given Scenarios design they were guaranteed to spiral into one direction, either being too easily removed or too efficient to pass up on.
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so what's to stop me from playing a Korathi Heatwave on them R1, and denying all their future value?
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Presumably they are somewhat like glorified veterans, I cannot imagine them staying for all rounds or something like that, so I would say them not being played before Round 3 should prevent you from using Heatwave on them.
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Played automatically from the deck? Still appear on R2 and R3 even if banished/seized?
It's almost certain they will be very powerful, the question is if they will be counterable or not.
I honestly do not know why so many assume that they will be able to just appear in all rounds or even pull themselves like Roach.
It sounds to me like they just reward you for keeping them for Round 3 (if you have devotion) and will be played once (unless you recycle them with Assire, Lippy (, can Renew them) or something else).