We’re not sure if it’s a sign of serious change on the Gowanus side of Fourth Avenue, but it’s definitely a sign of the times. Brooklyn Bean & Tea Company, which opened in September at Atlantic and Hoyt, is opening another cafe at the corner of Carroll Street and Fourth Avenue. Blogger Velvet Sea caught a “coming soon” sign being painted on blue construction fencing over the weekend, and passed by yesterday to find the temporary sign completed. Brooklyn Bean & Tea has won some converts over at Chowhound and bills itself as offering “organic, fair trade and artisan” coffees and teas. It will be a short stroll from hundreds of new condos on Fourth Avenue, so it should do well. Family Car Service, which was in the space, has been moved further back in the building.