Cure V will never happen, SE has already stated that no other job out side of whm (other than a pup's puppet) will ever have more than cure IV, which is why the "buffed" the curing spells in general.
Helix II would be nice to have, though with the way content is now I don't see how useful they would be when mobs (even NMs) die in relatively short times.
Weather II most definitely esp if they bolster the stormsurge merits giving them a higher stat-boost than the -Boost spells.