Eh, screw it. Squid Sisters amiibo, coming soon to a retailer near you pic.twitter.com/yzE8dsKSLB— Nikki ❤ (@NWPlayer1234) January 30, 2016
The info above was sniffed out by NWPlayer1234, who has leaked a number of other Splatoon info that was spot-on. The reference to idolA and idolB would certainly seem to indicate that more amiibo are on the way, and the Squid Sisters line up quite nicely with that reference. I guess we'll just have to hang back and see what Nintendo says!