In October, “Kumamoto Castle’s Grand Unveiling” (I got this English phrase from a paper brochure) will be held. As I understand it, this will consist primarily of access to the castle on specific days and times (see attached image). This is planned to coincide with the hosting of the Rugby World Cup. Should be a good opportunity to see the freshly repaired castle up close. I don’t think it will be possible to tour the inside of the castle, however.
– Kirk
P.S. At this writing, I haven’t been able to find this information in English. I assume that it will be announced in English for the visitors who will come for the World Cup.