Does the preview hint that Stannis hires the Golden Company? I didn't get that from watching it, and it doesn't seem likely to me, because I do think they are definitely keeping the Aegon plot intact. From the footage I've seen, it seems like Stannis is fighting with his own men only. I would also doubt strongly that the Golden Company would follow Stannis just to land at the Wall...
It's worth noting as well that Stannis might not actually have the money to hire sellswords. The writers have clarfiied that Stannis got a provisionary loan from the Iron Bank, and that more money will be lended if he meets with success... so I'm doubtful that they can even afford the Golden Company at this point.
The snowflakes are melting in your hair.
There are ghosts everywhere. We carry them with us wherever we go.