Seems like this blew up into quite the controversy. Here's what actually happened:
I sometimes play Fortnite (zero build) with my team. We enjoy the game and think it's fun. One time, someone said "wouldn't it be funny if there was a Pam skin?". It became kind of a meme that we would bring up, imagining ourselves playing as a full squad (4 people) with identical Pam skins. Then someone messaged me asking if I would ever want to "collab" with Fortnite and I responded. That's the extent of what's happened (see comment below).
Believe it or not, the idea of making money (I don't even know if you would make money from such a thing), or making Stardew more popular was never a factor in this. I am also very protective of Stardew Valley and beyond the one Terraria reference, will likely never put any other IP's into the game.
As to the console and mobile updates, they are still in progress, they are still being worked on, and it is my #1 priority focus. I will of course make public announcements when there is meaningful new information to share.