2.2 new coil- 3rd tomestone.. previous lockouts lifted
2.3 new ct.. previous lockouts adjusted
2.4 new coil- 4th tomestone (and final unless that little line is not a 3D effect on the tomestone icon).. previous lockouts lifted
2.5 new ct.. previous lockouts adjusted
3.0 expansion new (??)stone, new coil or other endgame raid, previous lockouts lifted
rinse and repeat

the patterns in 2.0 are obvious and given the time it takes for any changes to actually go into effect it would probably be more beneficial to request changes in regards to the next expansion then to 2.??'s life-cycle, especially given the fact that they are currently working on 3.0.