You can preorder them now and they will start shipping out on April 11:

Kipon Iberit 24mm f/2.4 at Amazon and BHphoto.
Kipon Iberit 35mm f/2.4 at Amazon and BHphoto.
Kipon Iberit 50mm f/2.4 at Amazon and BHphoto.
Kipon Iberit 75mm f/2.4 at Amazon and BHphoto.
Kipon Iberit 90mm f/2.4 at Amazon and BHphoto.

You get a free battery and grip with the S1-S1R preorder at BHphoto (Click here).

At last you can preorder the new Panasonic S gear on Amazon too!

Preorders:
Panasonic S1R at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic S1 at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic 50mm f/1.4 S at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic 24-105mm f/4.0 S at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic 70-200mm f/4.0 S at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.

If you own the expensive Leica SL camera or plan to buy the Panasonic S1-S1R you might need those:
1) Huge savings on the world’s fastest Sony SFG cards at Amazon US (Click here).
2) Big savings on Sandisk storage products at Amazon US (Click here).

In Germany:

USA Black Friday deals at Amazon, BHphoto, Adorama and eBay.
European Black Friday deals at Amazon Germany, Amazon UK, Amazon FR, Amazon IT, Amazon ES.