It’s really very different from Michlalah – it’s MUCH smaller, and much more yeshivish. What they have in common in the textual/inquiry-based learning (vs. hashkafic). It’s not quite like Hadar- or BJJ-yeshivish, though – it’s more like out-of-town, yeshivish background/aspiring yeshivish. VERY strong hashkafos. The closest seminary that I heard it compared to would probably be Bnos Sarah – with the type of learning you might get at Michlalah.
By the way, I think they have over 50 this year. So not to fear – it’s not getting smaller. (I am personally against this expansion, but okay.)