in preparation for the crowdloan unlock on October 24th, as discussed in this forum post, it was concluded to propose slightly increasing the ideal staking rate in Polkadot, such that the network can accommodate the new DOT that is being unlocked into the staking system, without reducing staking rewards. 

In short, what this proposal does is: 

For the current situation, the ideal staking rate would then be calculated as: 0.75 - min(45,60)/300 = 0.6, i.e., 60%.

You can find the full steps to reproduce the proposal in https://hackmd.io/ykunWzXYR-Kaz_cM2KNIlg. It is merely a 1 liner change to the former Polkadot runtime that was version 9430. 

The enactment time is set to this block, which is roughly 2 days before the funds unlock from crowdloans. 

The corresponding fellowship referendum to whitelist the call is https://collectives.polkassembly.io/member-referenda/24.