Very sad news indeed. I had to fight to hold back the tears when I saw the "Epilogue" video; they have meant a lot to me in my adult life. Incidentally, there were murmurs that they were going to score Argento's new film last year, but alas it was just murmurs. Now it's definitely out of the question.
TRON: LEGACY is a fantastic score (my favourite that year, and one of my favourites of the whole preceding decade), with massive crossover appeal that probably recruited more than a few new film music fans. But I love all of their other albums too.
I know they're notoriously secretive, but I hope we get to know some of the reasons for the break-up, and - more importantly - what's in store for Bangalter and de Homem-Christo separately now. If they have other collaborative projects lined up, if they're pursuing solo careers, whatever.