Microsoft usually launches new Surface products each spring and fall. It looks like the spring launch, where a next-generation Surface Laptop is expected to be the headliner, may be imminent, based on the latest information.
Earlier this year, Windows Central and WinFuture both posted information from their own sources about what could be next for Surface. Microsoft is rumored to be launching Intel and AMD versions of both the 13.5-inch and 15-inch models. (Surface Laptop 3 shipped with AMD processors only for the 15-inch models). The Intel-based Laptop 4's are expected to ship with Intel's 11th-generation Tiger Lake chips and AMD Ryzen 4000 processors.