Ok, since Grancypher's confirmed that the next event is indeed
Street Fighter collab and since this is going to be the first real event for anyone starting with English, a little primer on it:
The first thing you'll get when starting the event is a trust character, which since the first SF collab is being reran should include
Ryu. Place him in your party (front row or in reserve, doesn't matter) and as you win battles with him (all battles work, not just event) you'll gain trust points. Once you have 1000, Ryu becomes a permanent addition to your party. Grancypher has no details on how Rashid and Karin will be unlocked yet, so we'll probably have to wait for the official event announcement for more details there.
Anyways, there'll be event fights that you can do. These look to be solo fights against various Street Fighter foes, and will be split into
Sagat and Dictator (Sagat is Earth, Dictator is Dark) and newcomers
Necalli and F.A.N.G., each with their own drops if it's anything like the im@s collab that happened a month or so ago. Farm these drops and you'll be able to trade them in at the shop like so:

If I had to guess, the V and S emblems will be obtainable from both fights, while the Shadowloo emblems will be from Sagat/Dictator only and the SFV fights will get their own drop. The first thing to trade in for is
Chun-Li, a water character. The next thing is a Gacha Ticket, which can be used to roll the gacha instead of spending crystals. I'm not 100% certain on any limitations on the ticket but it may be possible that the ticket can only pull
Fist weapons and any potential associated units, which would be this pool:

(Since the ticket is old, it may contain characterless SSR weapons. Not exactly sure)
3% chance to pull an SSR of course but even amongst the SRs there's two potential 5*s to pull (Alec and Soriz) and a bunch of other characters. Also yes that is a bowl of ramen down there and yes it has a character attached to it and yes said character is voiced by Norio Wakamoto and can potentially use RNGesus to give your team instant full charge and I'll stop now :V
Third item is a SSR Fist with a few notable features. First off, it comes with what's considered an "Unknown" damage modifier, which gets a separate multiplier from the other two weapon types and thus should be gotten for any aspiring Water pools. The second effect is that if you equip the thing as your main weapon, your character's skin gets changed into a Ryu or Chun-Li cosplay. This does require playing a fist using class of which there's only one initially available but it's worth knowing about since water fists are rare to begin with. There's also the usual stuff to get with excess items such as half elixirs, JP, certs, and devil elements but the stuff listed above should be your priority.
Also I'm working on a Pastebin if anyone has questions they'd like answered.