for any who are interested: I played around with an ai a bit and tested the new auxiliary government. what it did was to prevent the loss of the planet. that is, I lost all the pop and thus the credit income, but I did not lose the planet, have to recolonise it, rebuy the upgrades or anything. it just stays at 0 infrastructure and the enemy siege frigs keep firing at it even though it's pointless ( well, not entirely, it keeps the planet from regaining health). so, conclusion: this is in fact a really useful upgrade now, maybe not for every single planet, but definately for some of them, for example deserts with many logistics upgrades researched.
also, I checked the ai surrender. what did you mean by 'informed' of the surrender? I didn't get a message or see anything in the diplo window. I just got the usual dialogue that I am victorious and whether to continue or not. nevertheless, the timing was pretty good for the surrender. shortly after I nuked and colonised his hw (and he only had one world left), so congrats on that one too.
on the whole a very nice update to round off a few edges.