Hi Martin,
I've just built v8 from source (rev. 13961) and apparently their API is quite changed.
1. For handles and context related operations you need to pass an Isolate (v8 creates one by default when inited, that you can grab with v8::Isolate* isolate = v8::Isolate::GetCurrent() ) - there are deprecated but still compile
2. No more method Object::GetPointerFromInternalField
3. No more method External::Wrap/Unwrap
Have you got any plan to update to the new version? If so I can test the changes on my side, let me know!
Ricky