They did http://www.autosport.com/news/report.php/id/111247
Looks like the new sponsor will be announced when the new car is launched in January.
You could be right!
So a deal that was agreed back in March, and was firm enough to set a specific announcement date, suddenly isn't so confirmed at the same time they drop the driver rumored to have brought new sponsorship?
Hmm.... This could have legs.
If its true, then I wonder what came first? Was Perez dropped because the Telmex deal fell through, or has the Telmex deal fallen through because Perez was dropped?