I got this over the weekend and have only given it a brief reading- it is very nice. The rules all seem pretty solid, and I already worked parts of it into my upcoming campeign.
Some areas were a bit unclear in my skimming, but I am going to attribute the problem to the light reading.
I did not see suggestions in the combat rules for hex/square map combat, but it may have been there and I just missed it.
I like the mage arcane engine the most- it is a spelljammer helm that does not screw the caster dealing with it.
SD