Since it has been mentioned already anyway: Traits and Properties - Suggestion for adjustments
An earlier time it has been discussed, although it is mixed there with traits as well which probably made it to much for most to understand the whole picture. Concerning the properties the main gist is:
- Removal of generalist properties/Removal of general balance issues causing properties: This covers for example health increase or crit chance. The first one is to generalist and simply good in every situation, the latter one is among the more problematic issues for game balance as everything simply crits to much. Crit as specialization for some careers is okay but everyone can get at least 15 %. There is a reason no other game has done this. It is not balanceable. Also, Norsca and Beastmen have separated into two separate things so that properties against Chaos are not so much better anymore than against Skaven.
- Introduction of new properties which covers elements not covered by properties so far as well as revisioning existing properties which do not cover what they intended to do. Example for this is the addition of a dodge counter property for mobility or stagger or cleave or ammo properties. Damage reduction has also been increased but only works against certain threats.
The main idea is obviously that there is no generalist good in everything properties (and traits) which end up to easily as picks for the majority of players. On the other hand, there are way more options for specialization to either cover weaknesses or to double down on career specific strengths which would allow.
But as already mentioned it was weaved together with changes in traits as the two interact strongly with each other and the synergy effects have to be regarded to make sure that ripple effects do not cause something to become useless or something to become stupidious strong as we have it with several stuff in the live balance.