au and UQC are indeed legally separate, and do have different branding, but the eventual shareholders and executives are common. (The other investors in the WiMAX side are passive).
It will be interesting to see how it goes.
One example might be in USA: Sprint Nextel has cdma, Xohm has WiMAX. Are they separate?
An alternative, which is split, would be KT / KTF in Korea. The former has wireline & WiMAX, the latter cdma & WCDMA. And they do indeed seem to be very distinct.
Not really.
The KDDI company with the cellphone network operates under the brand "au."
This is a very separate corporate entity to the part KDDI owned WiMAX operator UQC.
I expect that they are also separated by things like license conditions and the spectrum they can use.
My expectation is that au and UQC will target separate applications/markets.