Also - there is a way to dispute a flood map. Contrary to popular belief, this does not always require you hire an engineer, surveyor and perform a flood study. A landowner who believes the flood map is in error can file for a LOMA (Letter of Map Amendment). You do this for just the scenario you wrote about - a map that failed to take into account a hill or feature that renders the map inaccurate, among other things.
You can do that now - you don't need to wait on FEMA to get around to your community for revisions.
For a horse farm that brought in fill for an arena, or barn, or for other reasons - and believes that change brings that area out of Zone A - the LOMA-F is used to change the map. While this means you no longer need flood insurance - I'd still suggest you obtain it. It is really cheap if you're not in Zone A but Lordy if you ever have a Georgia type flood will you be glad you have it. Zone C can and does flood too.
Once the LOMA is issued a copy goes to local gov't and that information should make it into GIS. Don't hold your breath though - keep a copy!