I don't think that we can use it. Read this post about someone who flashed a US ROM to their TNZ Titan and didn't remove the radio:
http://www.geekzone.co.nz/forums.asp...age_no=1#89419
EDIT: Actually, found a thread on here where ImCoKeMaN was helping the guy dump it... but apparently his phone was working, it sounds like he just wanted to keep his standard radio and such.
Someone with a TNZ Titan should definitely dump their radio.
Though I imagine Sprint will be a little bit pissed if we beat them to the punch on Rev A
EDIT2: bradstewart is on TNZ and says he has over 2500 on download tests, which would implicate Rev A. Someone should ask him if he'll dump his radio for us.