So I read Thor #6... and my opinion is mixed
spoilers:end of spoilers
The issue starts with the Silver Surfer visiting Thor in his throne room, months after the battle with the Black Winter has ended, seeking to find out what happened and what's up with a "new addition" to the Bifrost. Apparently Thor has been in seclusion and hasn't talked about what happened to anyone.
Then the book goes back to just after last issues cliffhanger, Galactus attacks the Black Winter while claiming it's lying, while the Black Winter says it never lies and they made a deal and he's here to collect. Galactus asks Thor to aid him but Thor refuses and blast him with lightning before telling him to stay down. Galactus tries to reason with Thor by saying they are the only thing standing between the Black Winter and the destruction of the universe but Thor counters that he's the only thing standing between the Black Winter and Galactus and they have a short fight before Thor absorbs all his power. Thor then sentences Galactus to death for all the lives he's taken and injures him to the point where Galactus is near skeletal. The Black Winter intervenes and wants to just take Galactus and leave, but Thor says Galactus still serves him yet. The Black Winter wants to know what purpose Thor could possibly still have Galactus serve and Thor tells him: "a bomb".
Thor then uses Galactus to unleash "the full might of the immeasurable Power Cosmic, the bleeding life fore of a universal constant, the energy of a hundred, thousand devoured worlds. All of it unleashed by a god made king." into a blast so powerful that galaxies away children awaken to the sound of thunder.
In the aftermath of the blast nothing is left of Galactus except empty armor and the Black Winter is reduced to a single black snowflake, but before he dies says Thor has accomplished nothing and offers him a glimpse of his upcoming death to which Thor agrees.
Back to the present, where we find out the Bifrost's addition is that Thor has made Galactus' helmet part of it, and the Silver Surfer asks Thor what the Black Winter showed him, Thor gets a haunted look on his face and then we get a double-page spread of Thanos, wielding Mjolnir with the Infinity Gems embedded in it in his right hand while his left hand is apparently wearing Knull's gauntlet and he's standing in front of an army of zombie versions of various heroes. But Thor only tells Norrin he saw "Darkness. And nothing else".
As I said my reception of the issue is mixed, I'm not a fan of what Cates has done with Galactus and still don't like the retcon to his origin, but this issue doesn't actually confirm the Black Winter was telling the truth and the narration does refer to Galactus as a universal constant so who knows whats actually going on. While it's nice to see Thor get a massive win and actually uses his energy absorbing powers again after the last few years, the death of the Black Winter was anti-climatic and I'm not a fan of killing off Galactus or making his helmet part of the Bifrost.
And I'm sick to death of Thanos so the tease of seeing him again doesn't hold much appeal.