[2019] Riot aspires to run a game mode for every event going forward (along with other improvements to event passes)

https://twitter.com/xenogenic/status/1204847898799656960?s=21

According to u/RiotXenogenic on Twitter...

Yes. We aspire to run a game mode every event going forward, and if there is one, it will reward tokens for the event.

Some improvements mentioned by Xenogenic regarding event passes:

The Event Pass will come with 20 milestone missions, up from 5 in previous events. With those come many more rewards for you on your journey to getting the prestige skin (or whatever else you're after)

We're trying something new with Win of the Day, since it's the holiday season and people are busy. We're trying "Wins of the Week" missions that let you do them on your schedule. Example: Win 7 games or play 14, with a week to complete it. These are ALSO chained which means you have the entire event to complete all 4 of the weekly wins missions. Even if you miss a week, that mission will still be there when you get back.

The tokens rewarded for daily wins are increased from 18 to 28 (well, a bit more). Weekly wins give 200 tokens

The total tokens from Weekly Wins are 940 - almost half of the prestige skin. Given the flexibility of when you can do these and the increase in rewards, we expect the grind will feel meaningfully reduced to get Prestige skins - let us know how you feel about that!

And when asked about a possible return of Nexus Blitz:

Best answer I can give is: maybe