As 8th Edition raises its head up to the gaming community, rules questions are bound to happen. While GW has been great at answering questions, there are other locations (much better than the forum nonesense you typically find) and are quick and fast places to get a good handle on the rules.
40k Rules and Ruling Queries has grown from a private group to now one ready to help the entire community.
40k Rules and Ruling Queries
https://www.facebook.com/groups/40krulesandqueries/