Check out their website
www.loopz.co.uk
If they are in the pipeline they should be on there.
The nearest you will get is - The Altogether which is the only one I'm aware of that is 5.1. Its a dolby digital 5.1 and has specially made videos for all the tracks. Its OK but not my favourite album. The 5.1 adds an interesting dimension.
I've not heard any news of any SACD/DVDA.
You should buy the back catalogue anyway, just because they're quality.