The current status in their own words:
Yasuhisa Arai, Senior Managing Officer of Honda R&D Co., Ltd. wrote:In addition to conducting simulations, we have moved onto the next stage where we conduct full-fledged bench tests of the engine while connecting the turbocharger and energy recovery systems.
That still doesn't tell us much, only that they've moved onto the stage when the physical bits are bolted together. He doesn't even give a hint of a past or future tense. That statement could be true if the bits are in boxes on the way to the bench test. Equally it could also be true if the unit has had 1000's of hours of testing and demonstrated mind blowingly huge power with the frugality of fasting Cistercian.
ps - Don't forget the Merc PU press release showed a combined compressor and turbine ...
http://i.kinja-img.com/gawker-media/ima ... 662404.jpg