Summoners aren't getting a fix per say, they're just making Ifrit more useful and rebalancing the pets to make room for the 2 new ones coming out some time after 2.3

And Eos imo is much more useful then Selene. There will be more situations where your DPS will be more then enough and you'll need more healing. In this scenario, Eos has an AoE regen which stacks with Medica 2 and regen, and has Fey Covenant which increases not only your heal output but your WHM's heal output as well (basically a second Divine Seal for them to loosely compare)