Nilekani has been removed in 1 year due to some serious issues.
Myth 1 of Infy PR. "This is team rotation among co-founders". Truth: Well do u think they will have space for 5 co-chairmen in 2 years with each of other co-founders taking over? Nilekani is booted out
Myth 2 of Infy PR. "Kris will be CEO and Nilekani will do important contribution". Note the powers of Nilekani are significantly trimmed and completely removed from company functioning. Also they are very fuzzy..all within 1 year of CEO!!
This seems to be something similar to what happended to Phaneesh...hope the reason is not similar!
From the new role change in very short time it is clear that Nilekani is kicked out as politely as possible without affecting other founders stock options.