I got my brand new Lenovo X1 Carbon couple of days back. Being a touch enabled laptop it would give me the on screen keyboard more often than i liked and since i have a keyboard attached i never needed that. Since i never used a touch capable laptop earlier, i never faced this annoyance. I guess there might be some other too who'd like to disable this keyboard and may hit the Bing search as the first step.
The process is simple. Right click on the Task Bar, go to "Toolbars" and uncheck the "Touch Keyboard"