https://www.warhammer-community.com/2017/05/09/warhammer-40000-faction-focus-astra-militarum/
Reece from Frontline Gaming's Guard article is up, and while they were asked to write hype pieces for the new edition with no rules specifics, (see frankie's CSM article) Reece's has some tidbits.
"Nope, now, with the added “encouraging” presence of a nearby Commissar – which limits the losses of a bad Morale test – Astra Militarum are downright stalwart. Even Ratlings – with their sniper weapons allowing them to pick out and target Characters – will now be reaping a tally on your enemy’s leaders in the name of the Emperor!"
"Leman Russes, for example, have Toughness 8 and a 3+ save, so they won’t be slowing down until they’ve lost half of their 12 Wounds."
"Orders work automatically now and provide a variety of bonuses. You have 7 to choose from, but the one I want to discuss is ‘First Rank, Fire! Second Rank, Fire!’. This now makes a unit of Astra Militarum infantry treat their lasguns and hot-shot lasguns as Rapid Fire 2; that’s 4 shots per Guardsman at half range!"
So some questions maybe answered. Snipers sniping characters, how certain characters can effect morale, A tanks stats, and a bonus how guard orders work.