Liquid fueled launch vehicle manufactured by Mitsubishi Heavy Industries. Fairing types for payload can be seen here.
H-IIA / H-IIB Rocket Fairing | Kawasaki Heavy Industries
Look at the comparison posted by a WSJ aerospace beat reporter including pics of the side by side hex bolt inspection plates on the wreckage and the rocket. Guy's name is Jon Ostrower
https://twitter.com/search?q=%23mh370
Nicely spotted, I made some pics for comparison and you're right on the money.
