I know you all are secretly hoping for a bigger update, but I just can’t see it coming, sorry to burst your bubble. Every other faction that had an older first edition tome (except Stormcast, but we know how much GW loved them) has had a bare-bones update, that is a new Battletome, Warscroll Cards and (it they’re lucky) Scenery, Endless Spells and a new character. Why, from GW’s point of view, should Seraphon be any different? Indeed Seraphon are actually more likely to get a bare-bones update than those other factions because they had a lot more different units to start with.
Sorry to sound like the voice of doom, but I’m just telling you now that this is especially unlikely to reduce the disappointment later when GW inevitably reveal that Seraphon are getting a bare-bones update.