Yeah, the remake Shadow Dragon was a disappointment because the only thing I think they added was a save point feature (which was nice) but alot of the newer rules, classes, abilities, ect from the GC FE game was left out. Also as someone mentioned you get alot of extra guys but there's no way to up their levels without sacificing our main battle group, these just the arena mode which you can fight for cash/exp but unlike other newer FE games, losing in this arena mode kills that character--which sucks because the battles you fight are random. There's no extra side missions so you really don't use alot of these later characters so you'll never hear their backstory which isn't a lose because most of them are lame compare to GC FE anyhow.
Hopefully they do more than simply port the game, I wouldn't mind a remake (since we never did get III anyhow) as long as they improve it to match the games later in the series.