I'm a little surprised it's taking this long for some announcements to be honest.
Richmond --> Puma was first rumoured on the day BLK started going down (Nov. 16, 2016).
They were confirmed on the 1st December 2016.
GWS --> ISC popped up i think the 1st week of the year (Gold Coast --> ISC in the past couple of days), along with St Kilda --> Puma & Adelaide --> ISC.
Based off the time it took for Richmond --> Puma to be announced, the should be an announcement in a week or 2 (this is unlikely)
Also Groupie_ said that someone on the Richmond board said that Brisbane --> ISC