The first rumor is to possibly expect to see Ghost Rider in the, "Blade," movie in some way, shape, or form. I don't know if we are talking just Johnny Blaze (maybe Ketch) before he become the Ghost Rider, a brief appearance of the well-known flaming skull in the after-the-credits stinger, or what, but Marvel/Disney has plans for Ghost Rider in the MCU and he'll be popping-up in a Blade-related film, supposedly.
This leads to the next rumor I've heard that makes some sense but seems a bit more shaky. Basically, you may recall people were mumbling about a, "Dark Avengers," team, but thought it would be something like the comics with Norman Osborn. What if I told you this, "Dark Avengers," is actually just a more commercial-name for the Midnight Sons AKA Marvel's team of supernatural heroes? The thing is some of the better-known Midnight Sons have complex copyright concerns (Morbius has his film rights over at Sony), so if a supernatural team were being built why not just call it the Dark Avengers?
This could all turn out to be smoke being blown up my tuckus or it could end-up I'm right on the money. As it is, I am pretty ready to believe the first rumor I've heard and kinda see the logic behind the second, but think that is less credible and more a case of the people I've talked to stretching the limits of what they actually know versus giving me solid scuttlebutt.