It’s a known thing that Motorola Moto X was officially made available through AT&T yesterday and there is no word yet on launch date through other carriers. But here is a good news for users on other GSM networks ( atleast T-Mobile USA ). Samomamo , a senior member at XDA-developers got his AT&T Moto X sim unlocked and using it on T-Mobile LTE network.
Here is the video Samomamo posted on youtube that confirms AT&T Moto X works with T-Mobile LTE network.
Other Language Support
Below screenshot also confirms that AT&T Moto X includes Spanish, French & Portuguese language support by default along with English.
Source : XDA-developers