I'd like to see jump implemented, but as the letter indicated it's not a high priority compared to things like battle system revisions after all. You bake a delicious cake before you apply the icing. That said, it should be put in eventually, and a full unrestricted jump system, not a Zelda/FFXIII style one that's basically adding action commands rather than actually jumping. Having a jump won't call attention to itself after the novelty wears off, but its absence in a modern game, especially an open world MMO, draws lots of attention to the game's restrictions--just look at this thread. However, an action command based system also draws attention to how restricted jumping is, and doesn't make sense for the large open maps of FFXIV as opposed to the narrow linear corridors of FFXIII and FFX-2.

Either way, the message I got from the letter is that it will be put in eventually, as it should be, but it comes after much more important additions.