What old Moto radios are NB capable?

I was in a discussion the other day of what Jedi series radios could be narrowbanded to 12.5kHz. This pdf file from Motorola lists that the following discontinued portables "may be capable of migrating to 12.5 kHz Efficiency."

AXU4100
AXV5100
CP100
CP125
CP150
HT1000
HT1550 XLS
JT 1000
MT 2000
MTS 2000
ASTRO Saber
Spirit GT
SPIRIT M
XPR6300
XPR6500
XTN
XTS 3000
XTS 3500

Not sure what they mean by "May Be," probably just means depending on when the radio was made, or how it is flashed you are SOL. Why don't they just publish a "these will be paperweights after Jan 1st, 2013" list, or a FUBAR list?