SPOILER about the next flashback case: it'll be a two-parter, with apparently the following titles:
"Ran girl" (first part), "Shinichi boy" (second part).
Translation of the AC hints:
"Clover: I'll see you in the cinema! (
)/
Heart: [Ran GIRL] is a two-parter.
Diamond: After Ran GIRL will be Shinichi BOY.
Spade: The escape game was really fun~"
Thanks to bluesun and jimmy_kud0_tv2