The numbering system is still in play to a point...
HX (high rev), MX (medium rev), and LX (low rev) refer to the style of bowler that the ball is intended to roll better for
05, 10, and 16 still refer to the strength of the intermediate differential (Mass Bias) of the ball
There will still be releases outside of this system (Tour X, Tour SiC) which will serve the purpose of the "limited edition" balls of the past, like the 400A and 607A
Hopefully this helps! If you have any more questions, please let me know!