Blizzard use the formula:

(E-C)*rate_fact = awarded points

The existing formula for awarded points is

Contribution_points - C * .2 = awarded_points

Which implies for the existing system,

contribution_points = .2*E

Plugging in their .4 rate factor leads to

Awarded points = 2*contribution_points -0.4*C

Where,

C is your current total rank points and E is the weeks estimation or whatever they called it.

The -0.4*C is the decay term and 40% is the decay.

So basically the whole processes progresses twice as fast, aside from that itâ€™s the same system already in era. Note: this discussion hasnâ€™t included blizzards built in functions to limit how quickly you decay if you compete far less per week or donâ€™t enter the pool.