Ok guys, I dunno if you have noticed, so I decided to post this here.
There are three new items on the IGN videos, one of them is a Frozen Tuna from Uncharted 3 and it appears at around 1:40 on Parappa's Dojo video.
The second one is the Railgun from Starhawk and it's on the Hades video at 2:40.
The last one is the Murder of Crows from Bioshock Infinite, and it appears at 1:38 on Dreamscape video.
Here's the link with the videos: http://www.ign.com/articles/2012/08/14/see-the-new-playstation-all-stars-characters-in-action
So, the Atomizer and Murder of Crows were already leaked, but the Tuna is completely new! It's not a huge surprise, but it's better than nothing. haha
Thank you Koshi93MMA for finding the Atomizer and Frozen Tuna.
I'm sure I seen it. I think it on the Dojo video, not to sure though
Oh sorry dude, I didn't know what "sturgeon" was, thought it was a fourth item hahahah
Ok though, thank you guys for pointing it out.