So, as promised, at GDC last week I took some of your questions from this thread and went to the Ludei booth and asked them.
None of this is guaranteed to be true, I took notes, but I may have misremembered some facts, or been given incorrect information.
My first impressions of the Ludei people was that they seemed very tired and overworked - that could have been just the fact that they'd been running the GDC booth, but I was also told quite a few times that they are 'very busy'.
Advanced Web Audio
Apparently this is something that's extremely difficult to implement with their system, and they didn't give me any timeline for that.
No plans for this any time soon.
They had an OUYA at the booth running a cocoonJS game, but they said they haven't yet implemented microtransactions.
Apparently text rendering is extremely expensive the way they do it, and you'll either have to stick to updating text very infrequently, or use spritefonts.
Support and features for the C2 plugin
So this may be some good news - they are preparing to open source the C2 plugin and turn it over to the community. Should be a little while as they said they need to do a lot of internal testing but it's almost there.
Not responding to contact, request, etc
This was just a 'we're very busy' response, talking about the amount of users they are trying to deal with, etc.
This one was interesting. Apparently C2 is the only engine they have trouble with in this manner, and they have quite a few problems with the C2 implementation of memory management. They are convinced that C2 is doing this wrong, and making it difficult for them to do anything. Nevertheless, they did say that they had some workarounds in the works.
Hope this gives you guys some information.