the turbo discussion was a rumor which circulated around the time of the early KERS developments. The energy recovered by these systems will be available at the press of a button give the car a 'boost' some of the press stated this gave the car a 'turbo boost' which is why some people think turbos are going to make a come back.
I personally doubt that F1 will ever go back to the turbo simply as they are attempting to reduce costs. The latest suggestion put to the teams by the FIA is a single engine which is re-badged but identical. A large proportion of F1 costs are the engine's and as the FIA wish to make them last longer than two races for cost reasons any suggestions regarding turbos are laughable.

http://uk.eurosport.yahoo.com/180920...f1-engine.html