I hear rumors all the time about what's going to be in the next release of ESX. A full-featured [virtual] volume manager in ESX certainly would be a nice feature.
Existing VMware file systems today are very robust -- they can be extended in size online, but I don't think anyone really ever shrinks volumes very much, so I don't really see a huge need for that. [VMware's] VMFS [Virtual Machine File System] is designed to house VMware disk files and not meet the need of every possible data storage need. So if we see [a virtual volume manager in ESX], that's great. If not, a well-designed implementation doesn't need one.
As for virtual routers, I don't see where that makes a whole lot of sense. I don't want to see ESX become a multipurpose operating system. After all, it's a hypervisor, and a really good one. I'd rather let the router folks do the routing, just like I wouldn't want to see virtual machines running in a router.