From an overview article for "Inquiries of Heaven" (Issue No. 8 ) - the daily newspaper for the IAU 28th General Assembly in Beijing, China:
The Thirty Meter Telescope (TMT) represents the next generation of ground-based astronomical observatories. Driven by frontier science themes, TMT offers 10 times the light-gathering power of the largest existing ground-based optical/near-IR facilities and will produce images 10 times more detailed than the Hubble Space Telescope. With this tremendous increase in power, TMT will deliver as yet unforeseen, groundbreaking discoveries about the Universe. In short, TMT will herald a new generation of telescopes and will serve its partner communities as a flagship research facility.