I won't summarize all changes to scenarios and tactics as that's too much work. Happy to comment on it though!
In general, a bit surprising to see the streamlining change in battlefield type. It's now either Underhive or Ash Wastes. Underhive includes Zone Mortalis & Sector Mechanicus (without any details to distinguish them in terms of setup, deployment etc.). For the purpose of using the "latest" version as the most up to date and correct, this has some consequences. For example Rescue Mission comes in 5 versions now, and the latest is only for Underhive, not Ash Wastes. Which might affect as recent campaigns as Ash Wastes (last year). Not a big problem to override and use Ash Wastes if people want to do that.
Otherwise it looks like all scenarios are updates of existing versions, ranging from v2 to v5. Some nice quality streamlining in terms of the most updated Fleeing the Battlefield. Also removal of old stuff, for example Smash & Grab no longer uses the physical loot boxes to put secret traps in some of them, but instead roll on an alternative table. Which I think is a little bit sad as hiding stuff inside loot was a fun concept.
New standard 'format' that repeats across most scenarios:
- Removal of +1 Rep reward for playing against a gang for the first time.
- XP reward to victorious leader is D3 (instead of 1).
- Fleeing the Battlefield (voluntarily Bottles out and subsequently flees the battlefield)
- More use of Hybrid (new crew selection mechanic)
- Attacker & Defender: Attacker is the gang that issued the challenge (instead of the gang that chose the scenario)
- Tactics: More use of the new standard selection
That's all nice and consistent for these reprinted scenarios. Problem is no previous scenarios follow this format, and it is guaranteed to change as it always does. So in my opinion just another flavor of the month kind of thing. Hopefully at least some of the quality improvements can continue for future publications.