No news yet on the Hot Topic Samurai Jack T-shirts, although I've checked HotTopic.com regularly. So, in the meantime, have you all had seen the stuff at Cartoon Network Japan's Samurai Jack page?
http://www.cartoon.co.jp/cn_programs/view/00173 There are two Samurai Jack greeting cards which look wonderful. I can't read Japanese, so I have to rely on Google Translate.
It says that the card of Jack trying to sew his ghi says something like "Get psyched!"
Original:
http://www.cartoon.co.jp/cnp_greetings/view/0030Google Translate version:
http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&layout=1&eotf=1&u=http%3A%2F%2Fwww.cartoon.co.jp%2Fcnp_greetings%2Fview%2F0030&sl=ja&tl=en The other greeting card, which is quite beautiful, is apparently a "thank you" card.
Original:
http://www.cartoon.co.jp/cnp_greetings/view/0051Google Translate version:
http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&layout=1&eotf=1&u=http%3A%2F%2Fwww.cartoon.co.jp%2Fcnp_greetings%2Fview%2F0051&sl=ja&tl=en (Systran says "The jack is gratitude to your substituting. With utmost effort the jack speaking for your feeling, [ru] like. The person whom it receives to be deeply impressed, the [chi] [ya] [u]?!")