I guess some sites, it's still a rumors. I guess, in the middle of series this kind of changes will be unnecessary. I believe that till world cup T20 Dhoni will last as captain where as started his captain career. Dhoni must be good captain in terms of indian captain.
I don't believe such rumors that Indian team is divided into two groups, players are now more used to and familiar to play under the captaincy of Dhoni so there is no question that players are not happy with the Dhoni in t20 and ODI. Dhoni has already left test cricket and now only concentrating on shorter format. I believe that he will quit T20 after the world cup in 2016, people should allow him to take his own decision and there is no need to build the pressure.