Ahhhh, there are two types of Regulation changes: Those that get discussed with the Public (the meetings are going on now if memory serves), and those that are situationally driven over the course of the season. These could include early closures, extended seasons, change in bag limits, stream closure due to poor returns, low water flows, etc.
The first group will show up in the Game Regs (printed in Oct-November?) for the coming year The second group could happen any time. Only way you'll know is to go onto the Game Dept web site and look up the 'Region.'
Recommend everyone 'bookmark' the link above and refer to it any time you're considering fishing. OSP doesn't care if you know or not .... they just write the ticket.