Still about a decade away, but it will be cool. Here is the home site which I found a pleasure to browse:

http://www.tmt.org/

"The eight scientific instruments in detailed design for the TMT are huge in comparison to current-generation astronomical instruments, and equivalently more complex. Each instrument is the size of school bus or larger, and they rest on two platforms on either side of the telescope that are each the size of a basketball court. The biggest technical challenge among the instruments is the Planetary Formation Instrument, which employs “extreme” adaptive optics in an effort to directly image other planets, the board found."