Like its older brother, the new BLU Win HD LTE has a 5-inch display, along with 1GB of RAM, 8GB of Internal storage, an 8MP rear camera and a 2MP front facing camera. Unlike the BLU Win HD, which has a 1.2 GHz quad-core Snapdragon 200 processor, the LTE version has a more powerful Snapdragon 410 quad-core 1.2GHz processor inside.
Of course, the biggest different is that the BLU Win HD LTE can connect to faster LTE 4G networks on AT&T and T-Mobile. It also has dual SIMs and a 2500 mAh battery, versus the 2200 mAh battery on the older BLU Win HD. The BLU Win HD LTE comes in gray and yellow colors, with white and orange colors listed as "coming soon". Microsoft says this phone will be able to be updated to the final version of Windows 10 for phones when it is launched.
Source: Microsoft Store; Thanks to jobinthomas for the tip!