I am involved in standardization in my field and have thus insight and information about the contents of upcoming standards that are not yet published. I am co-chair of one standardization group that is working on a particular standard that is projected to be published sometime (rather towards the end of) next year. A lot of the content exists already.
There are not a lot of standards in my field as it is quite a new subfield and the contents of the standard are thus quite novel. I am currently writing a paper and would like to cite the standard even though it is not published yet (and very likely will not be by the time the paper will be published). But as a paper will "last/be relevant" for many years, for most of the papers' lifetime the standard will be published. And I think the reference to the standard enhances the quality of the paper.
I wonder if this is an acceptable practice (citing unpublished standards that kind of constitute not yet publicly available "insider knowledge") and if so, how to cite it.