An important consideration is how the change will be managed, ie what change management methodology or model will be used.
There are many to choose from and some larger organisations have developed in-house models.
The following links will take you to various Change Management Methodologies:
- Kotter's Eight Steps
- Bridge's Transition Model
- Prosci ADKAR Model
- Systems Intervention Strategy
- Kurt Lewin's Change Model
These links should give you a good overview of the methodologies. You can decide which, if any, you want to explore in greater depth.
Remember your company (or the consultants you're working with) may have their own models, however, being aware of some alternatives will stand you in good stead.