There are very few of them already (like stoneskin, sleep or sprint -for DoL though-) but i would like to see more of these in the future. I miss some FF11 "field" spells" like Invisibility, Deodorize and Sneak. And i think it'd be nice to have those kind of spells/abilities again, along with new others (from other FFs too). Some ideas,

Spells
- float (evades enemy ground-attacks in combat)
- charme / confuse
- frog
- warp (caster/party return at entrance of a dungeon)
- magic unlock (doors and chests)
- magic light (illuminates, in a range, darker places -this implies that some parts of dungeons or particular places could be very dark and they could add this kind of gameplay in some occasions-)
- firewall (useful in dungeons)
- fear


Abilities
- camouflage
- move silently
- lock picking
- disarm/arm traps
- steal money (steals gils only) / mug (steals items only)
- ride (increases the speed on a mount for a limited time)


And.. when that energy-wall spell we can see in the Limsa intro will be implemented?