It goes without saying, so obviously I feel the need to say it anyway. This will not show the number of people who will buy the board. For one, most people who order the board will not prepay. For two, some who prepay really don't have the money for the board. Still the second option nets Amiga 50 bucks.
The final success of the board also depends on momentum. If its taking off like a lightning bolt, then more ppl will jump on the bandwagon. It also depends, I think to a small extent anyway, the alternatives like G3 upgrades and maybe pegasos.
They might get 1,000 pre-orders if they are darn lucky, and this shouldn't be indicative of anything, except they really need $50,000 bucks really bad.