Just flashed it myself. It adds the 13, 14, and 15x multipliers, but only 13 seems to work with my AXIA Athlon 1200. However, the 12.5 multiplier is gone.
Report:
12x100 1200MHz obviously ok
13x100 1300MHz fine
14x100 (1400MHz) no POST
15x100 550MHz seems to be a 5.5x multiplier
13x108 1400MHz fine, runs windows, stable, etc.
It's odd -- I know my CPU can do 1400 MHz (13x108), but 14x100 will not post.
15x multiplier is actually 5.5x multiplier.
So, to answer your question, it adds higher multiplier settings, but only one of them really works.