No, I have no hard sources (or even soft ones for this matter) but I think Google may be headed in this direction--and if not they should seriously consider it after I came across this in my Google Reader.
(The Economic Times) Bharti Airtel and Google have announced a strategic partnership that will allow Airtel to bring Google search to the Airtel Live mobile WAP portal. [...]
"Mobile users outnumber PC users in India by a factor of six. The first computing experience for the majority of Indians in the next few years will be on a mobile phone." Said Manoj Kohli, President, Bharti Airtel.
If more Indian use cell phones than computers and if India is becoming more popular than Google's homepage then I wonder if a mobile version of Orkut is in the works?