Expect these to remain unchanged Mike.
Have a look at PANS ATM (ICAO Doc4444) 15.2 ‘Contingencies in Oceanic Airspace’ . and 15.2.3 ‘Weather deviation procedures' for the detail.
I believe that a 'Special Emphasis Item' Ops Bullitin will be published shortly that will summarise some items that's intended to compliment the NAT Ops Bulletin you refer to.
If you need more, PM me.