Alright, for fun, lets assume the Verg leak is real, and we get a trailer with Icies, Ridley, Snake, and Belmont this E3.
How would the trailer go?
My guess - Starts off with the first smash 5 footage we've seen. Flashes a bit of new link, and maybe a couple of other slight veteran revamps. Then, ice climbers are in the clips, almost nonchalantly. They start beating on the other fighters, cool stuff is shown off, etc. They do their up-B, grab a ledge, and on a zoom in of the ledge, you see a claw... Ridley swipes them off the edge. Cue to some Ridley gameplay, with throwbacks to his other smash appearances. we see him air-grabbing samus, smacking pikachu with his tail, etc. Suddenly, an explosion blows Ridley off screen. the trailer pans to the side a bit, and we see a familiar cardboard box. a ! appears above it, Snake throws it off. "did you miss me?". A bit of snake gameplay that blends into general gameplay, showing off a couple more obvious veterans too. Trailer ends.
Later, at the end of the direct, the Simon Belmont trailer comes separate, as is the tradition for third party hype.
Although IMO even if the leak is real, this combination of characters for the E3 reveal seems unlikely. I think we'll probably get 3 newcomers (although Simon+Ridley would def be hype worthy as two of them), and a kickoff of Smashbros.com again. Don't think we've forgotten your blog, Mr. Sakurai.