How to 'stay up to date' in your field?

In academia, it's important to stay up to date with the latest 'hot' hypotheses in the your field. By 'hot', I mean the hypothesis that are most important/topical/relevant/popular. Perhaps the best way of staying up to date in a given field is by reading the literature. But I'm wondering if there are any shortcuts? Are there any websites or papers that list the current most 'hot' hypotheses in each field? Google Scholar lists the most cited papers but I'm wondering if any resource goes one step further by listing topics?