There is a spec change though, but all for the better! I'm tired of using impedance adaptors to get rid of hissing, but at 107 dB/mW! Man that must be like the hardest to drive IEMs.
I listen at very modest volumes (75dbs) and with my superfi5pros + 5G iPod, I can clearly hear the hiss in between songs, and during quieter parts of songs. I don't carry the attenuator arround because that defeats the purpose of being "portable", so I very much look forward to these.