Tak Tom Mall has listed 4 of them on there site for preorder

https://takaratomymall.jp/shop/c/cTFss/

As well as on their promotional website

https://tf.takaratomy.co.jp/products/tf_ss

Just as an aside, I find the side column on the promotional page, the icons for each series seem so random.
The war for cybertron ones are way too similar
All the rest are their completely own thing.

I really think that Japanese marketing agents have no idea about... stuff.