To answer my own question, there is just four international routes that are served by the 787 (Frankfurt, Beijing, Seattle, San Jose):
Information regarding the Boeing 787-8ER route and flight operation dates?ANA SKY WEB
Out of these, only the Beijing flight is cancelled for today, whereas about 16 domestic 787 connections are cancelled. I suppose they have enought 777 to serve the other 3 international routes.
Interestingly, NH203 which took off about three hours after the emergency landing and arrived on time in FRA, was supposed to take off again as NH204 more than an hour ago. It is not cancelled and showing up as on time in flighttracker. It is hard to believe they could have flown in a 777 as a replacement.