Venice
Localised ordinary web results by the searcher's inferred location, making local intent apply to queries without an explicit place name.
What changed
Venice was disclosed in one of Google's monthly lists of search quality changes and made organic web results sensitive to the searcher's location even when the query contained no city or neighbourhood. This meant a query such as "plumber" began returning geographically relevant organic listings, not just map results. It substantially expanded the surface area of local SEO for service businesses and multi-location brands.
Timing
Rollout began 27 February 2012. No completion date was announced. Rankings typically remain unstable for the whole rollout window, so measurements taken inside it are not a reliable read on the outcome.