Nup, this topic is all about ORBX and ORBX-related releases!
An SBSL, by their forum, is:
SBSL = Side By Side Licence (licence that allows you to use ORBX scenery both in Prepar3D and FSX)
Also, the FSX/P3D migration tool that's currently in development will offer you two choices: convert your existing installed Orbx FSX products to Side-By-Side installations (available in both FSX and Prepar3d), or migrate your scenery fully from FSX to P3D, removing them from FSX entirely. The latter is designed more for people who are switching sims instead of running them both on the same computer.