Just recently a Hori P4U branded PS3 arcade stick has been popping up in import shops listings. It's available to preorder now but no official image has been released on what it will look like.

Amazon JP: http://www.amazon.co.jp/%E3%83%9A%E3...dp/B007XMU4AE/
AmiAmi: http://www.amiami.com/top/detail/det...e=TVG-PS3-1357