Japanese era (https://en.wikipedia.org/wiki/List_of_Japanese_era_names) will be changed in 2019 as the current Japanese emperor is going to abdicate the throne in 2019. At present, the possible date of change is April 1st, 2019. CLDR will need to be updated appropriately. The new era name will be announced maybe in 2018, next year.
We probably cannot get actual era name before CLDR 33 release, but may put transition date with place holder name.
Cannot do anything in ICU 33 release cycle. Pushed to 34.
CLDR needs to add intervalFormats data for skeletons including era (for gregorian, generic, japanese):
One question about placeholder name. Is the placeholder name, e.g. "ＱＱ", "Qqqq", acceptable by the Japanese community for pre-release/beta software?
Is there a guideline to get the community to test the change? Should this change be turned on/off on pre-release software?
actual data in