New Stormtroopers are available to the current IG as an elites, rules are in the WD. There is a chance the may be in the new codex too, so unless you're planning on a pure Stormtrooper army to run on it's own I'd hold off on buying this book until you know what's in the IG one.It is, but I'm am not a huge fan of buying a storm trooper force, I just want some rules fixed in the IG codex to match some of the crap that Tau has. I didn't figure on buying 2 new codexes....
According to the GW blog this release is similar to the LotD: a part of a codex that you can field alone if you want to. I'm not surprised they did this as they seem to be releasing options for specialist units to be stand-alone armies. Inquisition, Knights, LotD, and now MT.I hope we are, I'd hate to see ST's be removed from the IG dex, they make a nice counter point to the "rabble" and are a great way to work a different aesthetic into a IG force while keeping within the list. Normal IG book is out next week according to the WDW. AM is a new term rather the AA or AS which have been the official "in universe" names for ages but have never been used as official names by GW.
I know that the "Astra Militarium" doesn't exist yet, the term is used pretty much evenly with the term IG in the WDW and it says AM is released next week, but at the same time the screen shot I've chucked up above makes no mention of IG but does of the AM and a website is a lot easier to change than a hard copy (obviously).
My suspicion is that why would GW put the ST's in the new IG dex when they have just released a stand alone dex for them, surely it makes better "business sense" to get players to buy two dexes rather than one. Releasing them close together would make sense as it the two dexes would be riding the "oooohhhh shiney" factor of each other. I'm not saying that's what will happen, I'm just saying I could very easily see it happening.
Looking forward to seeing those Ogyrn though, really looking forward to seeing the sprues and how they gel with the Ogre kits.