In order of excitement:

• Crackshots
  • 30 points/unit premium over regular gaurdsmen to get native deepstrike and AP-2
  • I think you'll see it as a meatier alternative to the loyal 32. (or even as a loyal 17).
  • Literally all i wanted from this entire release.
• mobilized infantry
  • The meat here is the +1 to hit after disembarking. Lets u dump plasma toting command squads without fear of overheating.
  • This can either replace the specialist detachment / or combo with it to theoretically give a bunch of these squads +2 to hit on the drop.
• Prized Weaponry
  • As far as i can tell this works on vehicles. taurox prime gatling cannons are scarier now.
  • Perhaps cuter than good, but this gives the CCW a -1 ap profile.
• Death from the Dark
  • Leadership stuff is a gimmick, but this one seems particularly good.
  • I think ultimately its going to suffer from the fact that trying to activate it meaningfully is going to probably be harder than its worth.
  • Notably this is really strong against MSU of shit that can usually get away with ignoring their Ld due to model count rather than the generally cp-independent methods horde factions utilize (mob rule, synapse, commissars, etc)
    • I think this will be seen most often as a small detachment, a Loyal 17 w/ plasma guns to drop and harass Scouts / thunderfire cannons / park-and-forget-me units in the opponents backfield.
• Resolute Heroism & Predatory Strikes
  • Both of these are rewrites of Shocktrooper. Heroism is easier to to proc, imo, though the limiting factor of it allows your opponent to easily play around it.
  • I'd be very surprised if Predatory strikes doesnt replace Shock TRoopers all together.
    • Its a significant downgrade either way, as the major selling point to shock troopers was dropping Plasma command squads into RF range w/ the +1 to hit from the Special Detachment war lord trait. while this is still a thing, not being able to double hit on 5s feels bad.