I got the impression they were probably going to add to the boards, maybe a few new spells or abilities.
I doubt it. I think the improvements they're working on are more concerned with the groundwork; allowing for job changes sounds like a legitimate possibility at this point (I'm still against it personally).

As for what changes I'd like to see, well it's mostly minor gripes. Take Reverse out of the game, replace it with Zombie. Make it impossible for characters to switch equipment during battle, except maybe FFX style where they use up a turn to do so. Don't make Ethers/Elixirs/Save Crystals restore your Mist Gauge. Make Wither/Addle/Expose/Shear have an upper limit or only last for a certain amount of time. Remove Dark Energies from the game and nerf Meteorite D a bit (20k max damage). Remove Wither, Arise and Renew from the Monk's license board, maybe add Shear instead. Nerf motes, either make them not as strong as the actual spells or make them weaker (i.e. Haste Mote instead of Hastega Mote). Change 'rare poach' (5%) into 'unlikely poach' (20-25%) to make it an actually viable alternative for farming rare treasures. Increase chance to get a rare item with Diamond Armlet from 5% to 20%. Nerf Berserk by decreasing the speed boost characters get from it. Allow the player to do the Trial Mode in smaller portions across their playthrough instead of having to do everything at once. Make main game Yiazmat the same as Trial Mode Yiazmat. Make Drace use Curaga/Curaja/Renew on party members in Reverse/Zombie. Remove the invisible equipment - Seitengrat, Trango Tower, Gendarme - from the regular game and instead make them only obtainable in Strong Mode. And for god's sake remove the 99 cap on stats, it seriously harms end/postgame min-maxing.