Shaders in C3

Ashley , Tom Seems for C3 the shaders will be glmatrix version 2.0 and webgl2 features.

Actually C2 shaders uses QUAD that only accepts load one texture, so my question is,

Will C3 shaders be vertex to be able to load multiple textures to an object? Other info or maybe there will be an upcoming blog post about shaders and their new features? Something you can say now?

I'd like to know if C2 shaders will be compatible with C3 without changes, or will they require recoding like plugins?