I'm surprised we haven't seen anything of the new character yet? I thought maybe they'd have been shown or leaked by now.
Well, if it's anything like the Xmas 2018 event, we're probably going to get something regarding the new character soon. After all, there's a lot of event episodes, most likely covering all the girls up to this point, the event's going to end on the 27th, and unlike with Valentine's Day where there was precedence for at least one or two episodes that are related-yet-unrelated at the same time to the main event being released on the episode's second half, there's nothing to suggest they're going to do the same thing here, meaning they're probably going to release the next girl next Thursday.
Let's hope they don't do the same thing for June or August, though. I can understand them doing that for White Day, since it is a major event in Japan akin to Valentine's Day and Christmas, but I fail to see why they'd do that for June or August, since other than maybe Golden Week, I don't think there are any key holidays to utilize that kind of addition for girls.