While Samsung has not exactly wowed many with the Omnia M announcement a few weeks ago, the low-end Tango phone is important for the company and the platform as it allows them to compete with Android. Such is the reason why their launching of the device China Mobile and China Unicom is quite inspiring (China Telecom is supposed to get one too, but it was not yet announced).
The phones are slightly different due to the radio difference and they also vary on memory, with the Unicom version have 8GB of storage while Mobile gets 4GB. Other than that we're talking about 1GHz CPUs, 4" 800x480, 5MP rear and 0.3MP front facing cameras and everything else we expect from a Windows Phone these days. Interestingly, these are not technically Tango phones as they have 384MB of available RAM though they will run the Tango OS.
No pricing or release dates were revealed by either carrier, which is unfortunate. It should be interesting to see how Samsung prices their device against the even more low-end Nokia Lumia 610.