I have the same question. I'm getting the MSG feed on MSG+2, so I'm seeing the Rangers and not the Devils. Called technical support and they didn't know what the problem was, but mentioned they're getting multiple calls about it. This is a major screwup by FIOS.
After an hour of trying to get an answer by phone or online, I found it with the awkward FIOS search menu. it is on a non-HD channel, channel 81. It would have been nice for FIOS to put a message on-screen saying where to find the game. Shame on you FIOS.
Tonight Devils feed of the NYR-NJ game is only available in SD on channel 81. Outside of the NY region, the Devils HD feed is on GAMEHD 6, channel 1471.
Thursday's NJ-CAR game is on channel 81 only in SD, but outside of NY is on NHL Network in HD.
At this point, they're just moving 20 channes to MPEG-4, which will take up 50% of the space they currently occupy. This opens up room in theory for 20 channels in the MPEG-4 format, but there won't be that many because some of them will be in MPEG-2. Channels added to Prime HD (at the very least) will be MPEG-2 simply because there are still a lot of converters out there that cannot decode MPEG-4. This means that whenever TV Guide Network HD and MSG+2 HD are added in NY and NJ, they will be in the old MPEG-2 format. BeIN Sport HD will be MPEG-4 because it's in the Ultimate HD package. I don't have any idea of when any of this will happen, other than BeIN which has been announced to be available by the middle of April. As for any other channels, Verizon has done very well keeping that super secret.