jack: The default does not require a bankruptcy. However, it effectively does by seizing all assets including software, patents and hardware. That would mean NeoMedia was unable to continue business operations. Anyone who doesn't think the timing of the last SEC filing is unrelated to the timing of the default is kidding themselves.
The next sign that this closed up should be a filing with the Delaware Secretary of State dissolving the company - however, that is not mandatory and would require NeoMedia pay all their back taxes.
NeoMedia literally does not have to file another piece of paper. However, we should keep an eye on Pacer as maybe the only source of possible information.