Anyways I feel that the Rilmani most certainly do need some re-envisioning in 4e since how often are you going to encounter the forces of Neutrality and Balance? That's why I thought of them as an alchemically-evolved/ascended form of human. They have their castes, which some are good others might need some changes:
Plumach (lead) - need to be something else other than the commoner/cannon fodder caste
Ferrumach (iron) - fine as is, as the soldiers
Abiorach (alloy) - needs a change, they have to do something other than monitor elemental planes/ The Tempest.
Cuprilach (copper) - fine as they are as the assassins
Agrenach (silver) - fine as they are as the advisors/manipulators/infiltrators.
Aurumach (gold) - fine as the leaders.
As a race that seeks to bring down or exceed or even regulate the Gods, the Primordials and other powerful beings, they now become something that PCs are more likely to encounter, while retaining some of their previous fluff as the forces of neutrality.