Yes. In last dev meeting of Sculpt mode, they explained that they have to wrap up dyntopo refactor, focus on Brush code Refactor, fix multires bugs, think about redesigning multires for long term and work on texture painting project, too.
So, unless that is a project used to test brush code refactor to allow brush nodes, for later ; I doubt they will accept such proposal, now.
Anyways, that is too big to be ready to integrate, at the end of GSOC.
If it is accepted, that would not become a reality in master, before several years.
That would just end up as a fifth experimental branch about sculpt mode features.
At this point, a proposal about picking a feature present in previous experimental branch and making it rock solid would be more convenient.
These branches have a lot of cool stuff, absent of master.
- Brushes : Fairing brush, Scene Project brush, Sharpen Color brush, Symmetrize brush
- Lasso Project
- Auto Face Set creation
- Custom radius and projection for auto-smooth
- Custom Pressure Curves
- Roll mapping of brush texture
Because those features are bugged, not working or rashing experimental builds or nobody was able to split them and review them : all of that is stagnating in experimental branches and they are starting to be forgotten.
But if they were working and rock solid : they would be welcomed by users.
There are more than a dozen of potential ideas about sculpt mode, less ambitious than brush nodes : that could be the object of a GSOC.