>> I just wonder if the same thing will happen in BiaB, i.e. some 64-bitters will work while others will not.

I think they'll all work fine in BB Mario. Band-in-a-Box has direct support for jbridge, so it just works without you needing to do something ahead of time.
That makes it easier than other programs that don't support jbridge directly (if there isn't direct support, you need to make wrapped versions ahead of time). Band-in-a-Box and RealBand have jbridge direct support, as well as some software like Cakewalk Sonar 8.5.x, Cantabile 2.x, and VSTHost.

So far every 64 bit VST we've tested works immediately, including Kontact and SampleTank (full list on pgmusic.com/jbridge.htm ).

>> Also will a wrapped 64-bit VSTi stay wrapped when used in a 64-bit DAW?
Yes the 64bit VSTi will work fine in a 64-bit DAW because then you are using a 64 bit VST in a 64 bit DAW, so no bridging needs to occur.

Have Fun!
Peter Gannon
PG Music Inc.