I posted these ideas in another thread but it seems like it would fit in nicely here as well.
An idea that I had and wouldn't be mad about is if Ramuh and Leviathan are kind of one off spells or abilities with a cool down and they do different things when "summoned" such as a large amount of damage with a debuff, ie Ramuh will just come in for a large lightning AoE attack that paralyzes mobs then dissapears or something similar kind of how summons work in the single player games. That way they can get closer to their originial looks like a lot of players have been clamoring about since they aren't going to be sustained summons and just one offs plus they would add in some pretty cool looking and flashy spell effects like others have been asking about, also would take care of the 2-3 abilities we are getting instead of some other generic stuff pushing SMN away from actually summoning things. As for the LB rework they were tossing around SMN LB could be something like they summon multiple "Primal" versions of their egis (more full looking) to do huge AoE damage just like the BLMs have meteor, ie Titan, Ifrit, and Garuda all come out around the place designated for the LB and kind of all do their thing kinda of how the two new spells regarding Ramuh and Leviathan would work, just on a larger scale.
Essentially this will be the premice of SMN from here on out, since ACN was the base class they could only do so much with SMN by the time you got it to 50 and some people feel cheated as far as SMN goes. What this means in the long run is that SMNs will actually steer towards summoning more as more spells/abilities are introduced to the game and in just one more expansion or so we would see SMN doing what it's name actually implies, Summoning.