OPPO has already release the OPPO R1 on last December, those phone has sold in Chinese market and seems ready heading to U.S. market since FCC has approve and test those phone recently.
The OPPO R1 variant will comes with LTE capability, this phone is ready to works with T-Mobile and AT&T mobile signal in some area of U.S.
OPPO R1 is the nice smartphone that packs with 5 inch screen size with IPS display screen that has 720 x 1280 pixel, the phone is powered by quad-core 1.3Ghz MediaTek MT6582 processor. Sports with 2GB of RAM and 16GB of internal storage but there is no microSD card slot for memory expansion.
The phone is also coupled with 5 megapixel front facing camera and 8 megapixel rear facing camera with f/2.0 aperture that means, you sould take the good quality picture in low-light environment.
The OPPO R1 LTE version is also bring 2410 mAh battery capacity and running Android 4.2.2 Jelly Bean operating system with OPPO own user interface called as Color OS. There is no information about the price, but i China this phone is offers with $410 USD per unit. [source]