WYR3052 - $35 - Rail Crew Box Set
Master - Mei Feng:
-Better cache than other Arcanists
-Solid Df and Cb values
-Claws are paired, more stable damage and positive damage flips against burning targets.
-Kick has higher Severe damage.
-6 spells (as seen in the diagram)
-6 triggers (one of which is not in the diagram, Vent Steam -> Superheat is an ability)
-Scalding Breath is damage (not sure on details)
-Vent Steam is like Creepy Fog (may not block LoS for certain friendly units)
-Superheat makes enemies in Vent Steam aura gain burning tokens
-Railwalker makes you jump to btb with a construct (or Tail Worker?) within 5", do this twice (or thrice with the unlisted trigger)
-Seismic Punch moves nearby models
-Iron Skin gives armor to a friendly model (only Mei herself with the trigger)
Emberling:
-Arcane Reservoir
-Can dish out burning tokens somehow
Rail Workers:
Open Spoiler
-M&SU Members
-Have a Rst: Df spell to give burning tokens
WYR3058 - $21 - Metal Gamin (3 pack)
Open Spoiler
-Nominate a model they protect
-(0)action to charge models engaged with the nominated model
-Faster, but also more expensive, than other Gamin
WYR3053 - $35 - Rail Golem (this fella stands 78mm tall!)
-M&SU Asset
-Works on burning tokens (can get from friendly models (emberling, Railworkers), absorb from engaged models and possibly generate itself)
-Can spend the tokens on various stuff.. Reactivate being one such thing.
WYR3059 - $16 - Willie the Demolitionist
Open Spoiler
Also the wallpaper. (link)
Edit:
Put excessive pictures into spoiler tags.
Edit2:
It seems as if there'll be 1 Master w/ totem and ~5 minions per faction, so we shouldn't expect anything more than what we have here for the Arcanists.
Edit3:
Added some tidbits I heard through chatting with knowledgeable people, so not first hand and might have gotten some of it wrong, take it with a grain of salt.