@JStellato: Hi JStellato - great questions.
Regarding the re-balancing, this will a feature only available in the next version, so this will not work with existing (WS 2012 R2) servers. In the next version, rebalancing will happen on a supported configuration, which at this time requires at least 4 nodes.
SOFS is designed for several specific workloads based on IO traffic between the application (Hyper-V VM) and the storage. There wouldn't be much benefit in having this for things like Word docs because they produce such little IO. For regular file shares we recommend using a clustered file server which has been around for several releases: http://technet.microsoft.com/en-us/library/cc731844(v=WS.10).aspx (this guide is for 2008 R2, but the steps are the same for 2012)