The 9th edition rulebook is full of changes and clarifications but essentially these new rules are, at their core, less ambiguous than the prior edition and do a good job at removing multiple interpretations. It also introduces a new Coherency rule and checks and Command Phase. The New Coherency Rule - The 6 vertical limit has been reduced to 5 in the new edition (the height of a single floor of Sector Imperialis/Mechanicus buildings) and if a unit has 6 or more models then each model needs to be within 2 of 2 models now. Engagement Range codifies the concept of within 1″ of the enemy into a single term for reuse across the rules, and also adds a new feature – in 9th edition it now has a vertical component (5″) allowing for fights across different elevations in ruins, over crates or around barrels. Measuring distances now has a section of the rules all to itself. Unit strength and Destroyed units rules have been updated. The Command Phase is brand new for 9th and consolidates a few different things into one phase of the game. Essentially everything that happened in the void between the start of a turn and the movement phase, the before the movement phase rules. --from the publisher s website

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