Business Rules are continuing to evolve in MSCRM 2015. One new powerful feature is the ability to group conditions by "OR". Previously, conditions were limited to "AND".
For Example: I'd like to lock a field for editing if the Job# on the record begins with "2015" OR the Date the Opportunity Won is after January 1, 2015.
Previously, I needed two Business Rules to accomplish this. Now I can do this with one: