I would be concerned that a product that is supposed to ship so soon can be made faster overnight. Either the chips were made to run that fast or they have not ordered the chips yet. And if made to run that fast why not say so in the first place and tell everyone they will make sure they are stable so the speed could be approx that much.
Or they planned to sell crippled ones and then release better ones....
So confusing.
Chances are it was already a 'fast' chip, but you don't go around updating everyone on it until it's been thoroughly tested. Given they're probably nearing the end of the product development cycle, updating their website (and us on the forums) with "new" technical information seems very plausible.
And having various speed "tiers" for chips seems quite likely as well. Look at what Intel or AMD do for their CPUs...some chips can be exactly the same, but are factory clocked at certain GHz for various price points.
I have my doubts that BFL has the same capabilities as a intel or amd when it comes to making chips run faster or slower
depending on how they came out of the "oven". But I am no expert and I have no idea on their testing capabilities.
Also any software change takes time. Any board revision takes time. Heck.. anything that strays from anything that was not
planned before could cost BFL weeks based on their last performance of getting products delivered. That is the main concern
I would have as a customer.