Haiku actually seems to be trying to be something very different. The BeFS filesystem's use of metadata / extended attributes for one, very multi-threaded core

Haiku actually seems to be trying to be something very different. The BeFS filesystem's use of metadata / extended attributes for one, very multi-threaded core libraries and GUI for others. The kernel is also different giving the OS a very different feel. The goals for Haiku have always seemed around desktop performance unlike most *nix derivatives which either balance other workloads or focus on servers. NodeOS could offer something different, but what they have mentioned so far doesn't seem that interesting (then again I am not a Node or javascript developer).