Yeah I tried it with a pile of transit cards accumulated over the years from various places (Oyster, Octopus, Pasmo, Suica, Opal, Icoca, SmartLink, probably some others) and it was able to identify the Japanese cards but not do much more with the firmware I had.
e: it can read but can't yet emulate, given how niche it is outside of JP I doubt it'll ever support it.