UDTV with a 2,000-line (or more) display is being contemplated in Japan. The ideas underline the importance of scalability in future broadcast technology, and suggest that rigid standards will only have a limited life span. The MPEG-2 syntax would support the level of resolution found in UDTV, but actual tests of conformance at this resolution are not planned so far. In addition, a question of interoperability with other digital TV services will also have to be investigated.