Can UbuntuOne discover client instances on local network and treat them as cache before downloading from remote ubuntuOne server?

One of my use cases for UbuntuOne is for keeping several laptops and desktops (and ideallly a NAS!) synchronised on my local network.

My understanding is that at the moment new files are uploaded to the UbuntuOne servers, and then each client downloads the file over the WAN from the servers.

In the future, will UbuntuOne clients be able copy data across the local network in preference to requesting such multiple downloads across the WAN? (this also needs to intelligently handle the situation of multiple client instances on a local network having identical updated files that the server does not yet have -- we do not want more than one client to attempt uploading an updated file to the server at the same time, as that is again wasted bandwidth and I imagine could potentially lead to errors).

I understand that at the moment I can achieve much the same effect by manually synchronising the files on the local network myself using rsync or unison, but how safe is this?