Unlimited data usage will cost 4,935 yen (including tax) through April 2012. That translates to just about 60 USD or Rs.2600 INR approx !
Check out the plan details below
Here is the official statement regarding the speeds offered by the service :
Max. 37.5 Mbps downlink, 12.5 Mbps uplink (Some buildings: Max. 75 Mbps downlink, 37.5 Mbps uplink ) The speeds are theoretical maximum rates and do not indicate actual rates, which may vary depending on network conditions and communication environment.
Regarding the roll out , some cities will get the service by December 2010 , some by April 2011 and whole of Japan will be cruising at 4G speeds by April 2012. Time to move to the land of the rising sun ?