Application interaction after relocation is a consideration point, as well as identifying what data access may be affected by the move. While data center and server relocation can go hand-in-hand, this is a major project that will ideally be tackled on its own.
Tacking on additional changes, i.e., tiered storage, etc., can add significantly to the cost and increase downtime. Brainstorm with colleagues, IT, and the data center movers to create contingency plan and worst case scenarios.