This banner is interesting but also surprisingly tame. Flayn is a good sign for healers getting actual attention though, they've desperately needed that for a long time and Flayn is also notably the first healer to get a prf that isn't a FEH OC or Brave alt (or both). Shamir is obviously designed to be a Brave Hector counter and otherwise has a great base kit, Seteth is also a great merge project for Arena purposes due to his great support weapon, and well, Catherine is another fancy sword but she doesn't look to be exceptional among the sea of god swords we got earlier this year.
Either way though it's 3 Houses with popular characters so it's obviously going to be a popular banner, guess they figured there was no need to go too crazy with the units here which is nice. I might spark here for some fodder though since there's quality pulls all around, notably would be nice to get that Atk/Spd Solo 4 for my Ike but all this will depend on if the next legend is someone I want to merge (i.e. Micaiah). Seems likely that next legend will be Dimitri at this rate though, between the 3 Houses banner, Water association with "Azure Moon" and then Edelgard rerunning on the banner this month too. It makes so much sense, but you can never be too sure I suppose.