I just read on the official Formula 1 site that the reason is unspecified, but HRT will release a statement tomorrow morning.
To me its sounding like he lost his seat permanently. Senna wasn't paying for his drive (nor was he getting paid) and it sounds like HRT is in some financial trouble, so maybe they were forced to go with a driver that could buy a seat.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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