They’re for the new concurrencies and transferred members! Though it’s jokingly called the ‘Kashiwagi Rule’ now.

Everyone will participate in AKB’s singles and albums as they have in the past but -

For members who are based in AKB: 

. They are to participate in a minimum of one handshake event of their concurrent team’s theater editions. Their participation in Zenkoku Handshake events are up to their own respective schedules. (Or in this case, just Yukirin)

For members who are based in SKE, NMB or HKT:

. They will continue to participate in their original teams’ events and must participate in one or more handshake event (theater edition) with their concurrent teams. Again, their participation in National Handshake events for their concurrent teams will be determined by their schedule.

-If they cannot participate in a theater edition handshake event then they must participate in one or more National Handshake Event.

And then for Rena and Ikoma, it’s the same as the sister group to sister group ones. Except that Rena will have SKE, AKB and Nogi handshakes to do. 

Source: http://ameblo.jp/akihabara48/entry-11844077488.html

Source @48Family @ tumblr