They're showing up on my end although it looks like there might be an event related to Spade-chan getting set up. There's a new title screen with her head shot front and center and there's an option on the home page to toggle between having your usual assistant show up or having Spade-chan show up (no voice lines ATM).
EDIT: Looks like this is this year's April Fool's theme; Spade-chan shows up in place of Nazuna when you click the exchange button or the characters button as well. Guessing there's more Spade stuff to find.