Yeah, I would think Verizon would be first in line to offer Fight Network in the U.S. over their "FIOS" Fiber-optic HD service, now that they are a Fight Network partner.
Also, I've noticed Verizon is more willing to pick up channels that nobody else has (i.e. they are more experimental) because it gives them exclusive content, and exclusive content gives them an advantage in their subscriber base.
Not saying Fight Network would only be on Verizon, but Verizon is probably the most likely player right now in the immediate future.