Some news before tomorrow :

About pools :
https://irdpool.fr is running v4.0.1 and pool is ready to fork
https://irdpool.ca is running v4.0.1 and pool is ready to fork
https://irdpool.net is running v4.0.1 and pool is ready to fork
http://irdpool.ru is running 4.0.0 (not a problem for the HF)
http://youpool.io/IRD/ should be updated

no heard about other if they switch, stay tuned.