originally, the DSM overhaul was going to try to include looking at ASDs as less of a spectrum, and more of a 3D model - I htink they wanted a spherical model, with points (ie specific difficulties like APD, or sensory, or language difficulties) fluid both across the surface and between the surface and the core (if that makes sense) - to indicate both need and severity of need.
but that has all been chucked out, in favour of just lumping it all together unde rone tighter heading (can't really see how that is going to help many people)