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The changes to pyc format aren't user visible so shouldn't matter,
but what about the dis output?
Consider this program:
def f():
 try:
 1/0
 except:
 return "fail"
Currently it compiles to:
 2 0 SETUP_FINALLY 7 (to 16)
 3 2 LOAD_CONST 1 (1)
 4 LOAD_CONST 2 (0)
 6 BINARY_TRUE_DIVIDE
 8 POP_TOP
 10 POP_BLOCK
 12 LOAD_CONST 0 (None)
 14 RETURN_VALUE
 4 >> 16 POP_TOP
 18 POP_TOP
 20 POP_TOP
 5 22 POP_EXCEPT
 24 LOAD_CONST 3 ('fail')
 26 RETURN_VALUE
With zero-cost exception handling, it will compile to something like: 
 2 0 NOP
 3 2 LOAD_CONST 1 (1)
 4 LOAD_CONST 2 (0)
 6 BINARY_TRUE_DIVIDE
 8 POP_TOP
 10 LOAD_CONST 0 (None)
 12 RETURN_VALUE
 None 14 PUSH_EXCEPT
 4 16 POP_TOP
 18 POP_TOP
 20 POP_TOP
 5 22 POP_EXCEPT
 24 LOAD_CONST 3 ('fail')
 26 RETURN_VALUE
(There are additional optimizations that should be applied, but those are a separate issue)
The problem is that the exception handling flow is no longer visible.
Should we add it back in somehow, or just append the exception jump table?