ItsReallyJustAHorse

To be pedantic its technically rapid firecannon and not rapidfire cannon

Of all the firecannons, it's one of the most rapid.

It's an incomplete feature that only some champs (and only some spells on those champs) have the appropriate data for. You will also notice a few other oddities littered throughout tooltips currently. For example, sometimes you will see icons as scalers and sometimes you won't.
I can't promise exactly when, but all champs WILL get this in the future. I'll provide technical details in a followup comment.

Reinboom

It's an incomplete feature that only some champs (and only some spells on those champs) have the appropriate data for. You will also notice a few other oddities littered throughout tooltips currently. For example, sometimes you will see icons as scalers and sometimes you won't.
I can't promise exactly when, but all champs WILL get this in the future. I'll provide technical details in a followup comment.

Technical details:

So, the way we used to build tooltips is PRETTY bad. Basically, imagine ALL the text in the tooltip in a single long string. The title, "Mana Cost", and so forth. There are some variable values (like how much mana cost, or how much damage), but for the most part... all the text was clumped together. Importantly, this includes "structural details". And to just outright reveal that ugly truth... here's an old tooltip in its raw form!:

tr "game_spell_tooltip_EzrealMysticShot" = "Mystic Shot (@Level@)[@Hotkey@]@Cost@ Mana@Cooldown@ sec CooldownEzreal fires a bolt of energy, dealing @Effect1Amount@ (+@CharTotalPhysical@) (+@CharAbilityPower2@) physical damage (applies on-hit effects).

Ezreal's cooldowns are reduced by @Effect2Amount@ seconds if Mystic Shot hits a target."

All that stuff is that structural detail. And all of that goes to our localization teams. Which is not an easy mess to sift through if you're not reallllly familiar with the details. This means ...

Blazing117

They are typed manually, which means some champions are forgotten.

If it has the grid, then it isn't typed out manually. There's a system that generates the grid.

faitessure

I am gonna miss the 1v1/2v2 mode. i loved that shit

It will still be there.

pulo97

Does the fact that this is getting much more work done (visually at least) means that it will be possible to get this mode more frequently? It seems like if it has some popularity they can bring it back without having to change much each time.

Yes, it does mean that. :)
Our aim is that this isn't the last of Nexus Blitz and is instead an ongoing part of our modes roster that we'll bring back in the future as well.

Phoenix1615

You ma'am are now my favourite rioter

Thank you, but not a sir

ecoreck

Th...they didn't actually code the Nexus as a minion did they...?

I can only respond to that question with a "technically yes"... but also it's not incorrect to do so (as /u/Les_Petits_Morts well described).
Our base unit class is unfortunately named "Minion". It's possible to rename, but would be really annoying to do (will likely occur at some point). The minion that you probably most commonly think of when you think of a "minion" though are lane minions. Though all Lane Minions have the Minion class, the Minion class does NOT imply all the behavior of the Lane Minions.

The issue in this video is more related to handling swapping between two kinds of characters: A structure --> "Allied Epic Monster" (like Rift Herald). Part of the data for the structure half is incomplete. It will take adding a little bit of code to make that possible in our engine and a little bit of script to make it happen.
There should be a temporary fix out on PBE tomorrow stopping all worst cases. The real fix (via a new engine feature) will follow shortly after that (tho...