There are no major differences. The materials required for review and the steps of the review process are not different (revised APP, Section 4.8). The procedures are described more precisely and some details have been added: for example, the revised APP includes a more detailed description of the formation and operation of Department Tenure Committees (revised APP, Section 4.6), which are vaguely described in the current APP.
Another difference is that the review process continues until a decision is made by the Chancellor. Currently, if a candidate receives negative recommendations from their chair and/or the department tenure committee, they have the right to request a review by the school tenure committee. In the revised APP, the review process continues, unless the faculty member withdraws from consideration for tenure.