Yes, Rudolf is going to play next in Japan. Toho Musical & Play has posted dates of 6 May through 1 June 2008.

I'm trying to collect a bit more information, including who is in the cast (if anyone here reads Japanese and can help, please let me know). From the photos, it looks like Chinen Rina will be one of the leads... she was Emma in Jekyll & Hyde for one season there, and is heard on that cast recording.

http://www.tohostage.com/rudolf/index.html

Hello, everyone. I'm a Japanese musical fan. I think I may give some information on this TOHO muisical.
The title role Rudolf will be played by the 28 year-old Japanese actor, Yoshio Inoue, who has played the original Rudolf in the Kunze & Levay musical "Elisabeth" more than 400 times since he was nineteen. He also played the title role Mozart in "Mozart!", Chris in "Miss Saigon", Bill in "Me and My Girl", Matt in "The Fantasticks" etc. He also sang several songs of Richard in the "Mitsuko" musical concert in Vienna and has already been regarded as one of the most popular and talented musical actors in Japan.
Rena Sasamoto will play the role of Marie Vetsera. She is 22 years old and has played Eponine in "Les Miserables", Sally in "Me and My Girl" etc. She has a long career as an actress and is expected to be one of the leading musical actresses in Japan.
For other casts, I'll drop some information later.

Hi Kumiko - welcome to the group, and thanks for starting to post about the cast of the show. I've also been trying to collect some of this information (I don't know Japanese myself, so it takes me a while). Here's what I've found out, if you feel like adding more to it please do.

Rina Chinen will play Princess Stephanie (Rudolf's wife). She was Emma for one run of Jekyll & Hyde in Tokyo, and is heard on the cast recording for that.

Tatsuki Kohju (an ex-Takarisienne known as "Tartan") will play Countess Larisch. She actually played the part of Rudolph in the Takarazuka Elisabeth in 1996. I also hear she was in Jekyll & Hyde earlier this year, not sure what role.

Kenji Urai will play Johann Pfeiffer. And he is set to play the part of Rudolph in Elisabeth in August.

I have just posted some more names and a few web links on the Rudolf Page

Best,
Peter