ELUNA is ‘Ex Libris Users of North America’. Because the North American market is an important one to Ex Libris, and because ELUNA (previously NAAUG – North American Aleph Users Group) is large, they have traditionally had a large influence over development – in a way most national user groups have not.
To be honest, this tends to work well for RHUL, as ELUNA is exclusively (I think) academic libraries, and there are quite a lot of issues in common with the UK University library sector.
I suspect that there will continue to be a large amount of agenda setting from ELUNA, but with at least one ELUNA member also on the IGeLU steering group, this should work OK I think.