Hopefully the OP doesn't mind too much, but while we're talking Malifaux, what's people's take on the companion game, The Other Side?
But in general it reads a lot like cleaned up (i.e. streamlined for size) Malifaux.
In terms of size, it is approx 50 models per side, and it also isn't. Wyrd played a pretty clever trick where although you play with units of 9 models, they are broken into 3 fireteams (each 3 models on a single base), and the fireteam is really the same thing as a typical "model" in other larger scale games (40k, WM/H). They each move and shoot independently (while having to remain in "formation" with other fireteams in the unit), and the actual models represent the "hit points" of each fireteam.
So really, instead of 4-5 units of 10 models each and a handful of single models, you're dealing with 4-5 units of 3 "fireteams" and a handful of single model fireteams. So you still only really have to deal with around 15-20 entities each turn... That ends up feeling much faster and more manageable in play, while still having that "big army fights" look and feel. It's a pretty ingenious solution.
The other main difference (apart from scale) is that each unit has a basic side of the stat card and a "glory" (i.e. supercharged) side. The various conditions for gaining glory differ for each faction, along with a number of other faction specific rules all on a single card, making each faction feel very different in play.
I'm very much looking forward to having models ready to go and trying it out on the table.