I'll bite.. I'm one of those people that aren't especially happy with the design choices they've made with SMN so far to be honest.
That isn't to say it's a broken or non-functional job because mechanically it works just fine, however to me personally it doesn't really feel like a Summoner. It does feel very much like Affliction Warlock from WoW which is kind of Ironic because i feel Demonology Warlock would have actually translated better to SMN in this game, Metamorphosis -> Esper form etc.
Something like this but obviously based on current Egi:
http://www.wowwiki.com/Metamorphosis
See also:
http://finalfantasy.wikia.com/wiki/E..._Fantasy_VI%29
And:
http://finalfantasy.wikia.com/wiki/Terra_Branford
As for changes / additions / anything else that isn't really my place to say as it is SMN is a great DoT DPS class just one that doesn't bring to mind the images of the traditional Final Fantasy summoner.