I have a Slingbox Pro HD set up for my husband to watch in Japantoo and the Japanese EPG is not available. When you set up the Slingbox it asks you for which country the Slingbox is located and if you enter Japan you will see that no program guide is available. We get around this by attaching the Slingbox to a DVR that does have a program guide and control and record programs from there. Just be sure to get a DVR that has a remote control available on the SlingPlayer otherwise it can be tricky. Ours works very well now and my husband is very happy to be able to watch Japanese television when we are in the US.
Hope this helps.