There is 'speculation' that he will run for president again. [=some people think that he might run for president again]
The book is just a lot of idle 'speculation' about the future.
Her 'speculations' leave many questions unanswered.
(..) - Come on. - Listen. At approximately... ... p.m. last night, an incident took place on the Williamsburg Bridge. Much of what occurred is speculation... ...at this point. However, several eyewitnesses... ...to the crime, as well as our own preliminary findings, have... (..)2012 The Amazing Spider-Man