Turns out that director Marc Webb has been planning on using Electro for some time as he included an Electro Easter Egg in the Amazing Spider-Man movie in the form of a costume.
As Spider-Man leans over a railing we see the Electro costume revealed.
There's another clue as apparently Gwen Stacy mentioned a bioreactor during the tour group, and the Ultimate Spider-Man Electro was created by some sort of bioengineering process.
[[wysiwyg_imageupload:4385:]]In the Ultimate Spider-Man comic book, Electro is bald, wears a black leather outfit and has burn scars featured on his face.
The "Amazing Spider-Man 2" swings into theaters May 2nd, 2014 directed by Marc Webb starring Andrew Garfield, Emma Stone and Shailene Woodley.
Head on over to the Cosmic Book News Amazing Spider-Man Movie Hub for more news, images and trailers.