As obvious from equations (1) and (15), some observer's future depends on the prior from which his/her universe is sampled. More or less general notions of TM-based describability put forward above lead to more or less dominant priors such as PG on formally describable universes, PE and on enumerable universes, PM and and recursive priors on monotonically computable universes, S on S-describable universes. We will now comment on the plausibility of each, and discuss some consequences. Prior S, the arguably most plausible and natural one, provokes specific predictions concerning our future. For a start, however, we will briefly review Solomonoff's traditional theory of inductive inference based on recursive priors.