The last Gathering Storm book spoilers

This picture has blown up the internet today and rightly so. This is from the March issue of White Dwarf, showing Roboute Guilliman and his sons the Ultramarines fighting alongside Cypher and the Dark Angels against the Thousand Sons.

If this weren't somehow enough to convince you that the Primarch of the Smurfs are back, take a gander at the cover:

So, what does this all mean? Without a doubt it shows you who will be front and center in the Imperial Triumvirate box. As for what this means fluff wise there is no way to tell. One rumor source that faeit 212 puts stock in said this:

"1. the bolt pistol may belong to Cypher 2. three books for gathering storms series 
 3. each book will have a trio of characters
 4. last book is called the rise of legend/Primarch?, which obviously include a Primarch
 5. last trio of characters will be: Grandpa Smurf, Cypher and a Grey Knight Master
 6. then 8th edition
 7. Abaddon is likely to be killed during the last book, possible he is killed by a bolt pistol
 8. dwarf release and gryph hound release should still be there, but the focus is to finish  off gathering storm series and launch 8th edition


 Add on
 40k new edition's content will be much reduced, but still bit longer than AoS rules, around 30 pages, likely release date will be summer. after Book III of the gathering storm."

Its an interesting theory but how much salt comes with this serving? A comment from another 40k Group said something interesting:

"Here's my call. The rumor of Cypher heading off to kill Emperor will happen. The death of the Emperor will send out a psychic backlash across the universe and push the growing Eye of Terror back to negligible size. Ad-Mech will be able to build their own versions of the Necron Pylons to put the Eye in check, however, a new warp hole opens up (I forget the system name, but there was a rumor of a new "Eye" popping up). Roboute Guilliman leads the new Imperium, with his brothers back to aid him. Emperor becomes a literal god, the Starchild, and that's how the Imperium maintains their astropathy systems."

Whatever the case it will be another exciting development in the 40k universe. What do you guys think? Comment below!