It mostly mean to review https://github.com/v8/v8/commits/master/include/v8.h commits and figure our which one are relevant and what we have to implement and create issues for each specific feature or group of features.
At the moment we lack of modules and dynamic import support which recently went stable and also some minor APIs. Created tasks to implement relevant v8 changes in php-v8.
It mostly mean to review https://github.com/v8/v8/commits/master/include/v8.h commits and figure our which one are relevant and what we have to implement and create issues for each specific feature or group of features.