It’s in orbit currently. Status updates on spaceflight now and an NSF forum thread. There’s some technical material on NSF L2 about the HTV, for anyone there.
Hope all goes well. This is also exciting, if everything works, there are soon four space agencies that have docked to a space station – a few years ago there were only two. Spacefaring is coming closer, although this is still baby steps in a sense – the vehicles as well as the rockets used to launch them are expendable, and have been developed with ultra expensive national programs. They are the forerunners, grandparents of real spacefaring hardware that will hopefully come in the not too distant future, and be much easier and cheaper.