The second release candidate (RC2) of the proposed Forth 2012 standard (download) was released for public review on 13 November 2013. This is a three month review period, the committee will meet in March 2014 to review any comments received. Formal comments on the proposed standard should be posted to the Forth 200x mail list.
There is a public archive of previous drafts. These documents are available as PDF and in some cases the LaTeX source is also available.
To do that, I am trying a system here that is somewhat like the RfD/CfV system for deciding about newsgroups: A proponent of an extension or change to the standard writes up a proposal; this proposal is then published here as an RfD (request for discussion), and others can then comment on the proposal; the proponent can modify the proposal, taking the comments into consideration, or he can ignore some of the comments (if that's a problem for the commenters, they can make a competing proposal, or somesuch).
Anyway, once a proposal has settled down, it enters the CfV (call for votes) stage, where system implementors state, whether their system implements this proposal, or what the chances are that it ever will. Similarly, programmers can state whether they have used stuff like that proposed, and whether they would use the proposed extension once it is standardized. After a deadline, a preliminary poll result will be published, but the poll will remain open for adding to the Web page (especially system implementors are invited to do that).
Proposals in the CfV stage are eligible for inclusion in the Forth200x standard, and many have been included already.
A similar process, and closer in subject matter, is the SRFI (Scheme request for implementation) process for proposing extensions for the programming language Scheme.
Finally, Python has a similar mechanism: PEPs (Python extension proposal).