IANA has added the following:

NEW-INSERT LANGUAGE SUBTAG MODIFICATION for 'itihasa'
NEW-INSERT LANGUAGE SUBTAG MODIFICATION for 'laukika'
NEW-INSERT LANGUAGE SUBTAG MODIFICATION for 'vaidika'
NEW-INSERT LANGUAGE SUBTAG MODIFICATION for 'bauddha'
NEW-INSERT LANGUAGE SUBTAG MODIFICATION for 'sgs'

Please see:
http://www.iana.org/assignments/language-subtag-registry


We have also archived the following templates:

Registration form for 'itihasa'
Registration form for 'laukika'
Registration form for 'vaidika'
Registration form for 'bauddha'
Registration form for 'sgs'

Please see:
http://www.iana.org/assignments/lang-subtags-templates/index.html

Best regards,

Michelle Cotton
Manager, IETF Relations – IANA
ICANN