It's probably safe to assume that one of them was Honda, which remains committed to the series.
Yesterday an article, written by Energy Efficient Motorsport, UK, appeared online that states that the identity of another participant has been found out: Porsche. The brief article consisted of little more than a report of their seeing an on-line article by the German motorsport.total.com website which included quotes attributed to Wolfgang Durheimer, Porsche's Executive Vice-President of Research & Development, acknowledging the company's participation and continued interest in the talks.
You can read the article for yourself here:
http://www.eemsonline.co.uk/news/26-09-08_5
Porshe was briefly involved in the pre-split CART incarnation of the Indy Car Series back in the late 1980s, winning once with former F1 driver Teo Fabi.
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