IETA has been drafting a paper on Article 6 of the Paris Agreement jointly with the Climate Finance NGO group - the same group already developed a paper earlier this year. Please see the first joint paper, released in April 2017, here.
The new joint paper has now been released, please find it here.
The paper, co-signed by Climate Advisers, Conservation International, EDF, Forest Trends, IETA and The Nature Conservancy, has already been included in the IETA Article 6 Submissions Portal: http://www.ieta.org/Article-6-Submissions-Portal