No serious language problems
I went over to TDL & TDS in late November and had a great time, most of the signs are in English first with Japanese subtitles. Some of the entertainment is even done in English. The majority of the CMs know enough English to get by and in the rare case they didn't they would find someone who did. We also stayed in downtown Tokyo for a week afterwords and found the langue issues there to be very minimal as well.
The people of Tokyo in general and Disney Resort in particular were some of the most friendly well mannered people I have encountered anywhere. Thank you all.