While it looks like Dallara has a lock on the new chassis they're all putting their proposals out there. Lola hasn't provided any pictures yet they do have an interesting idea that I haven't heard anyone else provide
Originally Posted by 
At the heart of Lola's presentation to the IRL Board was a carefully considered modern dual body style approach. This concept will provide two ready-to-race, aero-performance balanced Indy cars that could compete even safer side by side and very close behind one another on all circuits. This would provide a unique focus for drivers, teams and fans alike without technical compromise or advantage and, in addition, would accommodate a dual engine supply situation if required.
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Because of cost concerns there isn't going to be multiple chassis manufacturers, and more than likely going to be multiple engine manufacturers either, so this seems to me like a reasonable solution; one manufacturer with aero-equal body styles. That way you have some competition, different looking race cars, and less spec racing while keeping costs down.
http://www.lolacars.com/newsstory.asp?NewsId=185