We're getting the Cloud Treasure next. Which'll have 3 ninja in it.

We'll have Samui and Omoi as rares (50-70 scrolls)

And Ay, The Third Raikage, as the super rare (180-210 scrolls)

My guess is that we'll get it in 1-3 months from now.

NOTICE: Samui and Omoi will BOTH be in the Great Ninja War treasure, which is due to come out after the Edo Split or the Cloud Treasure.

I'm pretty sure, I know we'll get Shikaku eventually, and come on, it's a treasure. It may not be Killer Bee (Would've liked those extra 80 fragments), but a new treasure would mean more money,due to the fact some people may buy seal scrolls/buy in events instead, making it unreasonable to hold it back for long.