Hello, this is coming from an inside source who is currently inside me as I type this.

There was a previous leak talking about how the Raimi villains will be fighting Magneto in the movie and I can confirm that it is indeed true. However thanks to my source I have a bit more info:

The scene starts with Magneto saying that this world must perish so that theirs can live, the reformed villains gang up in Magneto and they start fighting. There is a quick shit Aunt May and MJ as they look on with a worried expression. Magneto of course easily manages to defeat Doc Ock and SandMan (idk how) but struggles with Green Goblin now called the Gold Goblin. He smiles and takes off his helmet (it's William Dafren of course) and says that he's been planning for this, revealing that this shit is an Anti Magneto suit produced by the brand Lacoste. They fight and accidentally fall into a portal that opens up. 

They end up in a lighthouse and the movie turns into black and white for some reason? Anyway, Green Goblin smiles and asks if he doesn't like his goblin gas and Magneto angrily throws Lighthouse's vent ball at him. Then for some reason Booker Dewitt from Bioshock shows up and gets killed by it instead of Norman Osborn. 

As the fight continues multiple portals open up all around them. Norman smiles and says that "this is the ultimate showdown" and characters from other media start coming out of the portals.

The characters are the following:

Gandalf the Grey.

Gandalf the White.

Monty Python and the Holy Grail's black knight.

Benito Mussolini, and the Blue Meanie

Cowboy Curtis

Jambi The Genie

Robocop

The Terminator

Captain Kirk

Darth Vader

Lo-pan

Superman

every single Power Ranger

Bill S. Preston and Theodore Logan

Spock

The Rock

Doc Cock and Hulk Hogan

All came out of nowhere lightning fast

And they kicked Magneto in his tinboy ass

It was the bloodiest battle that the world ever saw

With civilians looking on in total awe

The fight raged on for a century

Many lives were claimed but eventually

The champion stood, the rest saw their better

Mr. Dafoe in a blood-stained sweater.

Anyway peace out, I can hear Kevin Feigay coming up the stairs so I might not be able to see another da

Raimi Spider-Man villains will be fighting to defend their universe in Doomsday