I tried to make this clear in the announcement, but it is worth explaining in more detail -- Sabayon Linux and Funtoo Linux are going to remain distinct things.
We will make the Funtoo tree work for Sabayon so we can all contribute to the same set of packages.
There is no implied change to either Funtoo or Sabayon, besides Sabayon moving to use the Funtoo tree, by announcing this collaboration. Each project continues to make decisions for its own community with no obligation to switch to different technologies unless one project decides it wants to.
Over time, we will be collaborating on technology and some technology will be shared -- because it will be designed to make both Sabayon and Funtoo communities happy. Due to the nature of ebuilds, we can build two separate projects using the same base as a start.
Sabayon has not had a lot of public activity because they have been heavily working on their next evolution of the OS. They have been very busy, but it has been behind the scenes.
Best,
Daniel