Has there ever been an article published about this type of research being under done or planned on? Or is this mostly speculation?
In my experience, drug companies want to make vaccines as cheaply as possible -- they are using old, outdated technology to make vaccines, and that is largely why so many vaccine-injuries are happening but they try to cover it up and make people think its all a coincidence so that they can keep selling more vaccines that cost very little to make. When a vaccine kills or maims too many people in North America, they will improve it (if forced) but still send the cheaper, more deadly ones to the developing world.

My point being, that nano-tech seems very expensive and probably a smaller profit margin, and the vaccine industry is not known for being high-tech or quality.
However, what I could see happening possibly is someone powerful (in government or otherwise) getting a pharmaceutical company to sneak in a couple of nano-bots quietly and without fanfare into a single vaccine, and then pushing that vaccine like crazy --like they did with the Swine Flu Vaccine -- and they use those bots to keep track of the people that took the shot.

It's hard to believe that the people would not rebel if they were told that those bots were in the vaccine. I seem to remember that at the time of the Swine Flu Vaccine some people were indeed speculating that there could be something nefarious about that vaccine that we weren't being told -- afterall it does seem strange that they pushed a vaccine so hard for a disease that never spread like we were assured it would. The swine flu was a scam. They could use the scare of Ebola to get almost everybody lining up for an Ebola vaccine.