I think Boon's poll has been a bit of a double edged sword (couldn't think of a better metaphor, it's still early over here). It help determined the most popular character from a small pool of characters, but it also showed that the second is only a percent off. The expectation now would be to add Static, as adding anyone else would cause a significant backlash for NRS.
Not that I'm against Static getting in, but if they had plans to add anyone else (on the hero side), they'll have a been of an uphill climb regardless of whoever they add.
On a different note, I kinda want a Crime Syndicate alt for a few of the heroes...(even though Bats and Supes have more than enough...)