You are right Rainer,
As much as I try to stay factual and keep posting informative links, with this GF/IBM deal in the fire, I cannot resist sharing an old "speculating" release about MIT and IBM.
Abstract:
Two researchers at MIT, working with an IBM foundry, have almost produced a monolithic optoelectronic computer chip
http://www.extremetech.com/extreme/118485-mit-almost-produces-an-optoelectronic-computer-chip