photo from Kyushu Yomiuri
photo from Yomiuri online
Well the Prime Minister was in Peru on the day of the beatification so the question of him attending was avoided completely. The national news on NHK at 7pm on Monday did have a quick mention of the events in Nagasaki on their news in brief segment. That was the only tv news coverage I found of the beatification. Other news shows may have mentioned the mass but I didn’t see anything more.
Online English sites had this article this article and this article Comparing the English and Japanese media it seems , as far as I can find on google, no mainstream English news sites covered the beatification while mainstream Japanese news sites did.
Someone who attended the mass already has a short video up on youtube.