It will come in domestically.
The RFL have to decide when to do it. They can wait till season end or just adopt it now.
Chances are they will adopt it straight away but allow some descretion to Ref's to give players time and not just send them off straight away.
They will need to write some sub rules for any possible disapplinary. So it may not be this weekend, but probably before seasons end as they will want the SL players up to speed come the WC.