There are newer-than-1999 versions of relevant EBU specs, as reported on the Library of Congress Format Sustainability site (https://www.loc.gov/preservation/digital/formats/fdd/fdd000357.shtml), which itself is a little old in the tooth (last updated in 2012). That formats-page update coincided with the publication of the revised FADGI audio metadata guideline (http://www.digitizationguidelines.gov/guidelines/digitize-embedding.html).
I have not time just now to look at the newer EBU specs (apologies!) and thus cannot report if they are at all helpful re: sampling frequencies, bit depth, or floating point math. Perhaps another reader will help us out. The bullets below highlight the most obvious aspects of these two specifications.
From the LC formats web page:
• EBU Tech 3285 - Specification of the Broadcast Wave Format (BWF) - Version 2 - (2011) (https://tech.ebu.ch/docs/tech/tech3285.pdf). Version 2 of BWF is a substantial revision that incorporates Loudness Metadata (in accordance with EBU R 128) and which takes account of the publication of Supplements 1 – 6 and other relevant documentation.
• EBU – TECH 3306: MBWF / RF64: An extended File Format for Audio (2009) (http://tech.ebu.ch/docs/tech/tech3306-2009.pdf). Permits file sizes greater than 4 GB and various types of multichannel audio.
Best from Carl Fleischhauer