chuck a few s5 blades in a box - make sure they're "screwed" nicely
put in a few quieter fans - not that loud but sufficient cooling (by the time it comes out, winter is almost over)
rack mountable ? yeah most likely oh yeah & a fancy LCD screen - but probably with thinner metal sheets for the case ?
try to avoid "magic" smoke from the psu's - stick in a better server type psu or even a VERY good idea & selling point + less headaches where the consumer can find a equivalent server type psu to be fitted/modded.
cost ? - i'm still gonna let ya'll willingly make me rich while u know it may or may not make $
prolly a little "nice" bonus with some miner software linking the miners
cgminer versions ? OS ? yeah there's gonna be sum sort of fukkup but hopefully not especially after releasing a new FW & the miners don't hash or go dead
NO free shipping
my guess - 6 blades minimum, air/fan cooled packed in a box (maybe a light weight one?), lcd display, server type psu = 3th/s (under/over clock-able) between 1500-2000w psu, FW/CGminer +/- abt the same, most likely (my guess) 8 blades underclocked = a lil more hashing power but lower electricity consumption & defo coming in a box (4u)
price -
1 thing for sure BM is NOT going to loose any $