Yes in the new 8th gen, though you can google primaris space marines and see they were JUST announced. They are brand new though so information is still coming out. However if you're interested in lore go to the Gulliman's page and scroll down to "Rise of the Primarch" and there is essentially an entire book about this:
http://warhammer40k.wikia.com/wiki/Roboute_Guilliman
Basically it pretty much looked like GW sat down and said "how ----ed can we make the Imperium?". And they took everyone's ideas and actually did it :P The gist of the story with the Primaris Marines though is that Big G asked a archmagos dominus (fancy techpriest) named Belisarius Cawl to do some things if he died/fell whatever. One was to take charge of the Emperor's blade that was passed down to him and make some fancy armor.
I'm unsure if he told him to work on the primaris marines in the event of his death or just in general anyways. But essentially he thought that one day the imperium would need a boost and this was it. So Cawl worked on this stuff for a long time, remembered the pact he had and waited for dire day that Gulliman spoke of.
Then all that ---- happened. The 13th black crusade, Cadia fell, mass warp storms, etc etc. The Imperium is in a hella bad position. So Cawl goes, wakes em up with the help of some Eldar, gives him fancy new armor and his Dad's sword back and after sorting out some of the invasion that's happening in Ultramar they go to Terra so Big G can take up his former position and lead the Imperium in these dark times.
It's hella hard, they get lost and ----ed with in the Maelstrom, lotta stuff happens. Eventually they get there, lotta losses you know the drill. Gulliman assumes his title of Lord Commander of the Imperium. Has Gawl bring the geneseed and marines he worked on over the last 10,000 years (yes he was alive during the Horus Heresy, nobody knows how he lived so long).
They're primaris space marines, bigger, badder, faster, etc but really green. Gulliman gives varying amounts to the existing chapters and also the ability to make new ones and also founds some new entire chapters with just the new marines. Some aren't so fond, some are, etc. No word on the chaos having any yet, they are brand new. But some teasers they have showed chaos marines that look like it ><
That's the lead up, as to info about the marines themselves I don't know really yet. They are brand new pretty much. They have a new generation bolter that Cawl designed. They are using new MKX armor with that sexy vox grill you see and it's an amalgamation of all the best parts of the former power armors.
https://www.youtube.com/watch?v=qYGrIBpE2PI
edit: and HMO just announced the 40k license too.
. God i want these things so badly though, SOOOO many badass character designs to choose from with warhammer 40k.
