If Russ does come back, we have officially reached the Wolftime. Hold onto your hats!
Remember how we thought Curse of the Wulfen would bring back 13th Company aswell?
Or how Wrath of Magnus SURELY was the Wolftime?
Or how the (second) 13th Black Crusade was THE Wolftime Event?
Or all the hints of NOW DEFINITELY IS THE WOLFTIME in our last codex?
While i WISH he would be released, I doubt it will happen...
...I believe it the day he greets me like an old friend, knocks me on my head, hands me an axe and an ale and tells me there are more heretics to kill.
It would be foolish to build these huge dreams up about
"Yes, surely SW will get a new Codex! And all these new rules! And awesome stratagems! And their own discipline! And a bunch of finecrap characters re-made in plast, HD and as Primaris! And a chapter-specific unit of Primaris! And Russ! And his Wolves!"
...you can regularly watch others cycling through similiar depressive rounds of high expectations, that will never be met, based on one little "sign" and a big bunch of fantasy.
I think the Lion is a similiarly 'possible'release up their sleeve.
And i bet, atleast on a conceptual scale GW
has (contingency) plans for all Primarchs on both sides - and equivalent stuff for the other factions like 'Beast Ghaz' and the like.
But who knows what they will actually give us.
They might keep them up their sleeve for less prosperous times, when they'll desperately need an influx of sales (or an increase of sales, to appease the shareholders)