As you surely know by now, Emacs 25.1 is out and available for download at the usual places. Check the Emacs download page for a mirror near you. They also have pointers to some precompiled binaries if you prefer that.
I built and installed the new version with no problems at all. The compile even seemed snappier than I remember. If you’re on OS X and want to use eww you need to use a slightly different configure line. I explained how to compile Emacs with eww on OS X for version 24.4 but the procedure is the same.
Meanwhile, Mickey has an excellent annotation of the NEWS file for the new version. You should be sure to give it a read to find out what’s new and changed. One thing I learned is that if you want dynamic modules you have to specify that on the configure line. I haven’t done that yet but if you want it be sure to add it.
I’m writing this with Emacs 25.1 but I just finished compiling and installing it so I haven’t done much with it yet. So far, though, everything seems fine. If you haven’t been living on the bleeding edge and using the development version, you can finally install the new Emacs.
Thanks to the many people under the excellent leadership of John Wiegley for this release. I know it was a big change and a lot of work.