I've expanded the wiki stubs crudely. Damien do you want any of this info here ?
Specifically I am thinking:

• only short overview.
• Concentration on the pyb module and/or other aspects like that ?
• how to handle different architectures and chip variants.
  e.g. if we did the '407' we might add camera capabilities. For themonster 386 based SOC I pointed to the other day - well its almost a completely diff codebase.