Some of the big changes are to require registration with the state for your system, and require a maintenance plan with a septic contractor (already required for drip systems in most counties).
The big changes involved will reduce the sand needed for mound systems, and possibly allow some places that would require a drip system to use a mound system instead. Atleast that's what I've heard, read and understood, but it will take time for each reviewing agency (health department or county engineer) to rewrite their regulations to align to the new state regs.
If you are planning on building next year (100% going to happen), you can always get your soil testing done now, and get your system designed now and hold on to the approval for next year. Also, remember, your septic system is sized by number of bedrooms.