The one that I had the most involvement in is the "Positive Expectations" scenario It has the development of better and better fabbers/rapid prototyping and rapid manufacturing that lead towards nanofactories.
For those who follow my blog, I feel that molecular manufacturing will be one pillar technology among many that will transform our technological future.
Key projects for the future:
Dwave's Quantum computers and if they don't work so well there are other quantum computer methods that are also coming. Quantum computers for molecular simulation will accelerate the development of molecular manufacturing.
Near atomic precision and not quite nanofactory nanotechnology. DNA nanotechnology, quantum dots, quantum wells, nanopatterning, synthetic biology are transforming medicine and many other applications.
Radical Life extension. SENS. If we also have full blown nanomedicine then improvement and change will be a lot faster.
Thermoelectric power. Up to double the efficiency of engines and energy systems. Uses quantum wells and nanoscale structures. It will transform transportation and clean up our technology by allowing us to eliminate coal and reduce oil usage.
Nuclear power. Fission and soon fusion (bussard, colliding beam, Z-pinch). 50% power uprates and new fission reactor technology (along with thermoelectric conversion) will rapidly clean up our power sources.