First glance the book is substantially bigger than ever before. Lots of background and fluff for Knights, Titans and Solar Auxilia.
The Relic Weapons section has some great bits of equipment to pimp your own personal Character such as the Vlka Fenryka's Burning claws and the Bolod Angels Photonics blade.
The Campaign system is simple and actually resembles the peg and link system that I was favouring.
My first impression of the Solar Auxilia is: They are a different flavour of Astra militarum. It will always be difficult to add certain rules which show them as being different, but not giving skills on the battlefield that would eclipse a Legionnaire. The Disciplined fire and Close formation fighting rules really give them a hold the line feel (hold the line rule really helps too funnily enough). I am already looking forward to getting these chaps in a trench and drawing a Legion in to have a bite. Put a Super-Heavy command tank with a Commander bellowing out encouragement or orders in the centre and rest assured they really will be difficult to break.
The Solar Auxilia Lasrifle is 30" range which also goes with their long reach. They also have void armour which amongst other special rules puts them at a respectable 4+.
Expect to see us using a squad soon in one of our famous reports.
It's great that Port Maw is such a key to the Campaign base, and I am really looking forward to reading about them.
We will give some more info when we can but all in all: Awesome.
Thanks Forge World, another great book.
Follow us on Facebook and keep up with our Solar Auxilia army we are creating.