Wait that was a copy paste error I just woke up bear with me

Dim

[HI3 - 7.8] Vita will be the character for 7.8. Most likely S-Rank Mech, but this part is subject to change.

Also seems Drive Core. But this one seems fishy.

[HI3 - 7.8]

A bit more. There's a new divine key and Kiana will be able to use Astral Ring.
Take this with a huge grain of salt, but regarding Sparkle, mentions of "Star Rail" in regards to her. As usual with a huge grain of salt.

[HI3 - 7.8]

Vita will be the character for 7.8. Most likely S-Rank Mech, but this part is subject to change.

[HSR - 2.5 BETA]

Seems no changes from a quick check.

[HSR - 2.x]

There seems to be an indication of a new type of gacha banner/set. No more information.

[HI3 - 7.7 BETA] Vita (NPC) Render

I wasn't going to but Vita is stronger than me...