In the Letter to the House of Representatives (in Dutch)on increasing information security, assurances are given that there will be an investigation to see if and how a more general information security policy should be embedded in the next instalment of the forthcoming Digital Government Act (Wet Digitale Overheid or WDO in Dutch). This will give a legal basis to, amongst other things, the aforementioned Government Information Baseline, or BIO.
Study
A study has been completed into the way in which accountability and supervision regarding information security can be devised. You can find the results of the study via this link (in Dutch).