Does that mean the entire pipeline will be running on the instance spinning the container ?
From here: this is what I understand:

Yes I think that is the easiest case, however I don't think it would be all that difficult to add meta data to the nodes that specifies on what kind of queue or node it should be run.

Yep, this is exactly what's coming in the next release of Pipelines (RC should be out in a week or so)

Well if that is coming out soon I'll wait with further development of the plugin as anything now would probably be too hacky anyway.