I thought you were supposed to choose which version of max you wanted from the 2010 release - they sent us both 3ds max and 3ds max design last year, but stated "Customers will have to choose which they recieve next time".
Not sure where you're supposed to do that though - I've not seen any info about that on the Subs site.
Certainly the 3ds max download had both 32 and 64 bit versions on it, I guess the Design one will as well when that appears.