Will it be fully compatible with LinuxMCE?
Can you describe the server-side architecture you are using?
What limitations, if any, should we expect to see in the finished version (relative to the current native orbiter feature set)?
Yes we intend to make this available to LinuxMCE and it will be GPL. There will definitely be a stage where it exists only in Dianemo...but that will short and will be before we open it up to a broader audience here. The idea is to get this broadly deployed and get as many people with UI Design/Web Developer skills using it as possible.
Hope the above is helpful.
All the best