I am happy about most parts of AF4.
One very big frown-factor and a smaller one which is: In its current state, the Behemoth is next to useless. It is promoted as being super-heavy as if this were a good thing but only feels super-heavy when I try to move it across a battlefield. If no unmasked close or medium range units are used, basically, it will enter the fighting zone two turns late while being a sitting duck. The force field would be great if in addition to a reactive armour, especially if applied after the RA which would render the Behemoth a walking fortress, something I would expect from the term "super-heavy". Alternatively, the weapon should be really devastating to balance the snail-speed. Perhaps even a secondary weapon for retaliation purposes that may even ignore stealth/ masking, something like a battle cruiser on land.
And by the way, regardless of speed and strength, in what warped, illogical universe does standing on a hill provide a *defensive* bonus? You only go on a hill to improve your line of sight -- while not minding improving your enemy’s line of sight -- for example because you are a fortress.
But even if it were such a walking fortress, and now for the big one, my primary reason for frowning these arctic days:
Why, for the love of god, does the Behemoth have to WALK? For that matter, why are there any ground-based or rather ground-dependent vehicles or units long after the advent of anti-gravity??? But it gets better: Why are there even streets left -- or let us say, the need for them?
While I do believe that even in the days of publicly available anti-gravity people would love to take a walk for recreational purposes (which I found reflected in the design of the solar walkway) the creators seem woefully adherent to the concept which, of course, may well be due to lack of imagination how different such a world would be -- which, in turn, could also be an explanation for the walking Behemoth. You have to comprehend first that with anti-gravity you do not have to use more power the heavier the object. When using anti-gravity, as the word implies, gravity ceases to matter. To the field generator it does not matter how heavy the encompassed objects are. Not even momentum really matters because if you are able to counter gravity, you will know how to generate it -- in every possible direction. You would be able to accelerate almost instantly and make seemingly impossible turns by letting yourself and your vehicle literally fall in another direction, assuming your field generator was capable of producing many Gs (g = earth's gravitational pull on its surface). And depending on the field size you could literally make cities "fly".
One addendum which is not limited to the Arctic Future: As someone who likes his city to be pretty, could you graphic designers please find a way for two-lane-streets to graphically merge with adjacent walkways? And also, if you moved the harbor exactly one building space unit closer to the potential city limits, one could actually build right up to the harbour and let it at least seemingly connect to roads and other buildings.
Furthermore, although this may be dreamland stuff, I would very much like to have a strip of beach to which I would be able to build my city right up to, fitting with beach-/ sand-based buildings. This is an old wish of me and many others and I am somewhat disappointed that with the new expansion of the potential city limits this opportunity for improvement has been missed.