Online sources say that T-Mobile USA could launch the quad core edition of HTC One X in the US market this September.

This model would be similar to the international edition of One X but is likely to be sold as One X+ branding.

HTC One X being sold in the US market today features a dual core Snapdragon processor which incorporates an LTE chip.

T-Mobile USA does not offer 4G LTE on their mobile network in the US market right now which would let them offer the international variant with the quad core processor instead.