While the phpBB module system that is currently used works it is far from being perfect for this MOD. Some parts are somewhat hackish, i.e. the add-on system and enabling/disabling modules. For a more efficient way of loading modules and in order to have a more user friendly module system the phpBB Statistics MOD should use it's own module system.
The target version of phpBB will be 3.1. This means there will be no 2.0.x release for phpBB 3.0. phpBB Statistics 1.0.x will get small updates with bugfixes and phpBB target version increases.