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BRAN & JON SHARING A WOLF DREAM

While Jon is traveling with Halfhand's team on the Skirling Pass beyond the Wall, he has a wolf dream. What makes it so interesting is that Bran also appears on it.

At first, Jon dreams of the direwolves. He thinks how they used to be six but now only five remained ( referring to Lady's death) and how they are all apart from each other.

Then, Ghost ( or Jon who shares his direwolf's mind) howls. It's interesting that the direwolf who never makes a sound, is acting different within the wolf dream:

He sat on his haunches and lifted his head to the darkening sky, and his cry echoed through the forest, a long lonely mournful sound.

It's Bran who listens to Ghost's howling and answers. Bran who is miles away hiding in Winterfell's crypts. It's interesting to note that the communication doesn't happen through weirwood because neither Bran nor Jon are close to any weirwood tree.

Jon?

The call came from behind him, softer than a whisper, but strong too. Can a shout be silent? He turned his head searching for his brother, for a glimpse of a lean grey shape moving beneath the trees, but there was nothing, only...

A weirwood

The weirwood Jon sees is more slender than the usual ones and still growing- perhaps bc Bran is still small/ hasn't even started his apprenticeship under Bloodraven. Also it has Bran's face and three eyes- foreshadowing for Bran taking Bloodraven's place as the three eyed crow? Or maybe simply foreshadows Bran becoming the pupil of the three eyed crow, something he accomplished in ADWD.

Another interesting passage is about the weirwood/Bran's smell:

He sniffed at the bark, smelled wolf and tree and boy, but behind that there were other scents, the rich brown smell of warm earth and the hard grey smell of stone and something terrible. Death, he knew.

It's possible that death foreshadows the fate of Bran Stark. Maybe Bran Stark the child needs to symbolically die, in order for the Bran the greenseer to rise. But it could also hint to the darker side of greensight. We know that human sacrifices were performed in front of weirwood tree. And as the end of ADWD we also know that something sinister is happening in Bloodraven's cave.

Finally, Bran reaches out to Jon like the three eyed crow had once done to him and instructs him how to see through Ghost's eyes. Jon is no longer only inside his wolf dream but also wargs into the awaken Ghost.

We know that Bran is a more powerful greenseer than Bloodraven because he's able to also communicate with the people who appear in his visions. Here it's shown once again how powerful he is because he didn't even need to be near to a weirwood in order to travel to his brother's dream.

As for Jon, I think it's possible that he's not only a warg but also a greenseer himself. And that's why Bran is telling him to open his eyes (like Bloodraven once told Bran). After all, as far as I can recall Bran didn't have a similar shared dream with any other of his siblings.

I'm looking forward to see them interact more via shared visions/dreams on TWOW once Jon is resurrected. And I believe it's possible that Bran will be able to reach out to Jon even while he remains stuck between life and death.