I absolutely love the models. Mortenebra2's teasers sadly sound massively underwhelming. Battlegroup Flank for a turn is okay, the field marshal looks useless. Heal when an enemy Warjack dies in melee range, who cares? We aren't Trolls, our current light & heavy jacks don't survive to counterpunch. My non colossal warjacks are typically at full Boxes or dead. On top of the fact this Feild Marshall does literal nothing vs Hordes as teased.
Kharbydis is going to depend on how his cloud creation works, his cost, & his damage output. Prowl is irrelevant. Stealth'd heavies get obliterated nowadays, it's why I've stopped playing Nightmare with Deneghra in favor of a Kraken, Snapjaw, or Barathrum. The rest of his kit is going to make or break him. Regardless he's a jack I'm going to buy simply because his sculpt is amazing. Honestly I'm hoping his arms are squid tentacles that can forfeit their attacks to "squirt ink" letting him place a 3" cloud within a short range for each attack forfeited. If he can cloud wall all by himself that would be interesting, if he pulls a Gorman and just centers a single cloud on himself I'm hoping the cloud at least has some kind of effect and isn't just a cloud. Either way Kharbydis has me enthused.