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.
(..) ...who'd drowned in that river years before. Others claimed he was a dinosaur left over from the "Cruaceous" Period. I didn't put any stock into such speculation or superstition. All I knew was I'd been trying to catch that fish... ...since I was a boy no bigger than you. (..)2003 Big Fish