The departure briefing is more than just an RTO briefing. It is the expected plan of action for any non-normal event as well as the expected normal procedure. Although my suggestion is based upon my airline's 'Threat-based Briefing,' there are a number of things that would be pertinent for any multi-crew operation:
1. RTO briefing as you mentioned - crew coordination and actions in the event of an evacuation
2. Engine failure after V1 - engine out procedure, crew coordination and plan of action (holding pattern or immediate return and type of approach)
3. Brief the charts - expected taxi route, SID/departure
4. Terrain
5. Weather
6. Operational threats - in Africa this is pertinent
Again, this is what we use but a thorough airline-type briefing for departure and arrival covers all the bases.
Hope this helps.
Fly safe.
Jefferson Airplane