One possibility I haven't seen discussed is that the 5Gh/s units get shipped before the bigger models. It seems like this could happen if BFL is not able to meet its specs since the smaller the unit the less offensive it is.
It could end up that buying the Jalapeno was the better move.
From what I've seen, they are hashing at higher rates than advertised. The notable exception being grnbrg's machine, but it was a 'pre-production sample'.
Hashing at higher rates, yes. I was talking about power consumption.