The international standard (IS 10514) has been voted on and will be official as soon as the comments have been attended to.
Where can I get the Modula-2 standard?
Who is the convenor of the standards group (WG13)?
A. Mark Woodman at email@example.com. NOTE: Mark Woodman has not been available for some time, and Kees Pronk firstname.lastname@example.org has been appointed by SC22 as interim convenor of WG13.
Will I be able to read the standard?
The grammar can be found at http://www.twu.ca/faculty/fnas/math/rsbook/Appendices/Ap3.nisus.html. For classical Modula-2, see also COCO (section 4.9 of Rick's FAQ).
Differences between classical and ISO Modula-2: ISO Modula-2 has resolved most of the ambiguities in classical Modula-2. It adds the data type COMPLEX and LONGCOMPLEX, exceptions, module termination (FINALLY clause) and a complete standard I/O library. There are numerous minor differences and clarifications.
WG13 is working on two additional standards (separate from the main one) for (a) object oriented Modula-2 and (b) generic programming facilities. A ballot is at least several months away. Various versions of the latest generics proposal are stored in the directory ftp://FTP.twu.ca/pub/modula2/WG13/.