Yes, tomorrow is Martin Luther King, Jr. Day, but it's also the filing deadline for the IL-05 special election to replace Rahm Emanuel, and the IL Board of Elections will be open to receive nominating petitions. That'll finally give us some clarity on the Democratic field. The special primary, by the way is March 3rd. The general is on April 7th, but that will almost surely be a formality - Kerry won this district 67-33, and Obama 73-26.
Also, one of the candidates running released an internal poll for the Dem primary. Anzalone-Liszt for Mike Quigley (1/8-13, likely voters, no trendlines)
Mike Quigley: 19%
Sara Feigenholtz: 11%
John Fritchey: 8%
Justin Oberman: 2%
Cary Capparelli: 1%
Jan Donatelli: 1%
(MoE: ±4.4%)
You can find a run-down of these names at Wikipedia. One big difficulty with this poll is that it didn't include labor lawyer & netroots fave Tom Geoghegan, who declared shortly before this poll went into the field. So I'm not really sure what to make of these numbers.
I wouldn't be surprised if we see more polling once the field is set. But like almost all specials, this one will likely be a bear to survey accurately.