dante wrote:
i think most ppl will know who appear talking to Dr. Curt Connors in the cell. Can't wait for 2nd installment of this reboot.
by the way, the best scene is Stan Lee's cameo part.

This Amazing Spider-man really pull it off finally. More agile, faster, stronger, it's everything a spider power should display.
The guy who played the mysterious guy is Michael Massee.

Quoted from Wikiepedia,
Ifans said of the scene, "Connors is sent to an asylum, a high-security asylum ... [a]nd he's visited by, shall we say, a representative from OsCorp. How he gets into that cell and how he leaves that cell without the guards knowing? We have yet to find out."[261] The unnamed character, played by Michael Massee, is credited as "Man in the shadows".
So, could it be Norman Osborne?
Trivia fact:
Massee discharged the weapon which accidentally killed Brandon Lee in 1993 during the filming of The Crow. The shooting was ruled an accident, but Massee was nevertheless devastated, returning to New York and not working for a year as a result.