The Support Update?
Even though the tank update is up next i'm more excited for the eventual Support Update.
With the recent release of Ivern, and now Rakan, the support role has gotten a lot of fun supports over the last 2-3 years.

However many other champions in the support role basically either do the exact same thing. Such as Heal/sheild Bots

And play exactly the same as eachother, for the most part. Or are simple tank's that really only have one ability that put them in the support role.

While it's fine for the support role to have a diverse set of champions, Healer's, Tanks and Mages. It isn't fine for the champions that were built for said role to be exactly the same as eachother with very few differences such as with the healer's, or to just be mages or tanks that were forced into said role.
Bard is a mage but he was built to be a support mage not a battle mage, last time i checked zyra, brand and malzahar were not meant to support.
Tahm, thresh and braum are all tanks but their kit's were meant to be for supporting. In leona's case she simply has lots of CC and that's good botlane, you can take sion down there and get the same effect. Blitzcrank has an absurd pull is really the only reason he's down there too, even if i don't think he needs a rework.
I really am hoping to see some changes to Nami, Janna, Soraka, Lulu and Sona eventually that set them apart from eachother a HUGE ammount, similar to the assassin rework, each assassin is now completely different and i'd like to see that with the support role. Especially with how fun Rakan is to play.
- Karma I'm surprised wasn't mentioned, being the only one pretty much confirmed to get a rework in an Enchanter update. For Karma I'm hoping her solo-laning is restored, and maybe see her adopt a supportive niche which synergies more so with melee champs. Her Mantras should all be viable throughout the game, wherever she's being played. Also, the shieldbomb needs to return with a delay. More options, higher skill cap, and less general reliability for the Enlightened One.
Ivern gets a shield that deals damage and slows? Pfft! Mine does way more damage than his! Wait... you mean his will still explode even if it gets broken?
and
are not an obligation to have anymore.
is left completely out of the update even though they mutilated him into the support position