Just came back from the tour today. Highly recommended even for the non-Japanense speaker! There's an English version of the printed material at the check in. Just ask the person giving you your lanyard badge. Lots of interesting items at the gift shop, nice exhibits, and the classroom presentation was fairly understandable. Highlight of the tour was the maintenance hanger of course! Lots and lots of opportunities to take pictures or have your picture taken!
Couple of points from my own experience:
Google Translate was extremely helpful in figuring out how to fill in the forms and the follow on emails from JAL.
If you're taking the Monorail to Haneda, make sure to take the local and not the express. Station is Shin Seibijo after the International Terminal stop and before Terminal One, not to be confused with Seibijo station before the International Terminal.
ETA: There's an offer on the back of the admission badge for 100 miles when enrolling in JMB at the tour and a special kids JMB card for their enrollment (if Google Translate is translating it correctly). Didn't know!
Last edited by rustykettel; Sep 21, 2016 at 4:29 pm