Alan Wake's sequel has been rumored to be around for some time, though we haven't heard very much about it and we actually thought it was cancelled for good at one point. But Remedy apparently isn't done with the survival horror just yet.
A trademark application for "Alan Wake's Return" has been spotted in the Office for Harmonization in the Internal Market (the trademark office of the EU), having been applied for by Remedy themselves on the 23rd of February.
A trademark application can come at many points in the development cycle depending on how secretive the company wants to be. If the IP is already too big, they may apply for several potential marks before any work is done to secure the right to use the name they finally choose. Smaller projects might wait because the public nature of the system tends to expose anything in the works. In this case it might even simply be related to the "return" of Alan Wake to the scene through the backwards compatible version. Hopefully it's an actual real, bona-fide, new game though.