Where/how to sign up? Thanks.
It's a future benefit that will be announced in the near future. They expect to roll it out in a few months (possibly sooner).
While it will be touted as a new benefit (and something is better than nothing) what it is really is the ability to apply for the global entry program with a waived application fee, that's all.
Anyone (who is a citizen or legal resident, or a dutch citizen) can apply for one, there is no guarantee it will be granted, and the application fee is 100 (waived for US-cents).
If you have a Sentri or Nexus card, there also is no application fee (no need for a Cent card).