There seems to be a bit of 'naiveity' here - did you seriously expect a "leaked" version to have some text identifying it as such?
A leaked version of the firmware could be one that someone either acquired legally and that individual failed to comply with non disclosure agreements and made available to others - or it could be one that someone acquired illegally, by breaking into some one else's poorly secured system.
Leaked does not mean it is not genuine, it means it was not officially released for public use - which in turn means it may have bugs or lack the features of the official release - a greater danger (to my mind) of using leaked firmware is that you do not know it's origin and what may have been changed - is there a root kit or remote access trojan included in that zipped archive?
You may (or may not) have noticed that I did not make a definitive statement saying that it was leaked, but rather, I suggested that it may have been, based on the name, and I questioned where it was obtained from.
The source is what determines whether or not it is official lor leaked - If I gave you a firmware and said it was genuine - you'd have to take my word for it, but if you personally downloaded it from D-Link themselves, then you'd know it was genuine.
I have two questions for you ...
The first - did you personally download that version from a D-Link web site? If not, you really haven't a clue as to it's authenticity.
The second - would you expect an english language firmware on the D-Link China website? Or would you expect one with the web interface translated? The chinese market is not a small one, most manufacturers (including Microsoft) are offering product customized for the market and I know that at least one router manufacturer is offering product with chinese language firmware.
Looking at D-Link China's website - the only firmware currently offered is 1.03b41 - don't you find it a little strange that they would skip 1.04 & 1.05 and offer 1.06 even temporarily? I was unable to download the firmware to see if it matched the 1.03 that was released by D-Link USA, or if it's web interface was in chinese, but the documentation that I could download had been translated.