I don't know. After seeing how poorly SE treated summoners in FFXI, I almost don't want to see Summoner in FFXIV. One job ability every minute (updated that after what, 4 years), summoning skill useless unless its over cap (which is one of the slowest skills in the game to skill up), pointless spirits for years, no pet+ gear for most of the game's lifespan, brew doing absolutely nothing for them in Abyssea, having no unique spell/ability, being tossed into healer role (don't summon lol) for most of the game by the community, enemy out of range bugs, pets still have AI, pathing, and ability use bugs... it just doesn't seem worth it to put it in FFXIV and have players go through a broken job again.
I'd rather see Blue Mage than Summoner, especially with the art style FFXIV has.
Major difference is that, as has been said, Summoners were put into a game that didn't have the necessary mechanics for pet jobs. +pet stat gear should have never come to be, and instead should've had avatar stats scale with SMN stats (the way it's done in every other game with per classes). Their attempt to design the class as versatile to fit the subjob system is what mutilated SMN into /WHM for several years before they even tried to start fixing things. Then there's the irrational fear one of the developers had to pet jobs. My gut tells me it was Matsui (the same guy who is behind battle design in FFXIV), and I hope I am horribly wrong. That is, unless Yoshida is truly in charge and can pimp slap any idiotic notions of pet jobs being OP for A, B or C and keep them from getting in the way of development.