Swapping out the bump sensors for IR is something that we really want to do, we just have to finalise the manufacturing details.
The robot shown is just a prototype, the shipped product will have at least the functionality we have stated - and probably a lot more.
http://www.sharpsme.com/optoelectronics/sensors/distance-mea...
Having come back from Botball, I have to say that overall this robot doesn't feel fully baked.