Google has renamed one of the items on the left hand bar of the search results. The left bar was launched in May 2010 when Google completely revamped their search interface.
The bar contains relevant search filters for your query. Some times it had a filter named “Updates,” when used, it would show you search results discovered in Google’s real time search index. That button has now been renamed to “Realtime”.
Here are before and after pictures:
Hat tip to Tim Cohn for spotting this and letting us know.