We plan to do a blog post about this when we submit a PR to mainline, but you can see the session at Node Interactive where we discussed some of these - https://www.youtube.com/watch?v=Zbc3SwMDWf0&index=14&list=PL....
Looking forward to the neutral binding layer for different javascript engines for Node.
Ideally for a given platform a native Node module should be ABI compatible with v8 Node or Chakra node - without the need for recompilation.