Or is it possible that we can use DVB-T tuner in a HD Dreambox to watch DVB-T2.
Like the CXD1981 LG hybrid DVB -C/-T tuner (with dvb-c HD support)
Wikipedia shows me this info at DVB-T2 page:
This system transmits compressed digital audio, video, and other data in "physical layer pipes" (PLPs), using OFDM modulation with concatenated channel coding and interleaving. The higher offered bit rate, with respect to its predecessor DVB-T, makes it a system suited for carrying HDTV signals on the terrestrial TV channel (though many broadcasters still use plain DVB-T for this purpose).
Since the DVB-T2 physical layer specification was complete, and there would be no further technical enhancements, receiver VLSI chip design started with confidence in stability of specification.
Who knows if we can use CD1981 for DVB-T2