I've written a PEP about this topic. It's PEP 340: Anonymous Block Statements (http://python.org/peps/pep-0340.html).
Some highlights:
- temporarily sidestepping the syntax by proposing 'block' instead of 'with'
- __next__() argument simplified to StopIteration or ContinueIteration instance
- use "continue EXPR" to pass a value to the generator
- generator exception handling explained
Very nice. It's not clear from the text, btw, if normal exceptions can be passed into __next__, and if so, whether they can include a traceback. If they *can*, then generators can also be considered co-routines now, in which case it might make sense to call blocks "coroutine blocks", because they're basically a way to interleave a block of code with the execution of a specified coroutine.
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