I don't know the percentages but Watson is built on UIAM http://uima.apache.org/ which has bits in C++ and bits in Java. From there I am sure different teams used language bindings to use the language that best suited their particular needs to accomplish their tasks. Not that I know it to be true, but I would not be at all surprised to find R, Haskel and even some lisp in their somewhere.
Thanks for the link. That looks really impressive. For IBM this is presumably PR for their products/services. I do hope they disclose more of the architecture as I'd love to build out a system like this, even on a smaller scale (takes 6 hours to come back with an answer rather than three seconds).
My understanding that this is the beginning of their DeepQA product line, my assumption is that the research and portions of the technology will be used for business insight and analytical to answer what if type questions.
,Just to be clear I don't work for IBM, and I do not know their intentions for the project, but I do take projects from IBM and have taken projects related to Watson, but I do not know their plans to monetize Watson, the former is just pure speculation on my part.
