We are making an order with coupons (many emails with BMT in last two weeks). Here is what we found:

Its not a april fools joke, it is called AntMiner S7-F1
Low noise
identical performance with low power (6000 RPM fan)
Low weight&size (may have effect on freight cost for large order?)

The fan is not same (don't know the other one):
http://www.digikey.com/product-detail/en/delta-electronics/QFR1212GHE-SP01/603-1165-ND/1850534

BMT also wrote on Twitter.
https://twitter.com/BITMAINtech

I try to upload pictures when we receive miners (this is a new account).