Hi The Sailing Committee have updated the Sailing Instructions - relatively minor updates covering recent changes that have been covered until now by an "amendment to the SIs":
new fleet organisation details [NOR Section 8]
updates to the course board usage [Annex C]
use of the "pink band" to indicate an alternate windward mark for the slow handicap fleet [SI Section 8]
The latest version of the document (V3-4) can be found here