I have residential FIOS. My inbound port 80 is open. As to whether your port is also open is hard to say. Quite a few people in the Verizon FIOS forums on dslreports website reported previously closed inbound was repored open.
That policy started to change in 2009. Some subscribers reported the port was quietly opened. It appears the change was rolled out as part of network upgrades, so it did not occur all at once.
There has been no official announcement yet from Verizon, so you may or may not have a blocked inbound port 80. At this point, use it if you've got it. If you have to ask for it, Verizon may not give you the answer you're looking for. Yet.
My take on this is your FIOS service is usually directly proportional to the amount of competition in the area. My FIOS service is very good because I have 3 other cable service providers to choose from.