Those rumours about 3G coming to T-Mobile are getting a little more traction with this poster announcing October 1st. as the date the switch is thrown. The major American launch cities include New York, Chicago, Orlando, Detroit, Atlanta, Los Angelas, Washington DC and plenty more. While the only new BlackBerry on T-Mobile’s radar in the near future is the 3G-less BlackBerry Kickstart, it does open the door for the next 3G BlackBerry to come along. Maybe the BlackBerry Bold sooner or later…?