The first device, aptly named the Xperia X7 and the other named as Xperia X7 mini. The Xperia X7 has specification like, it has 4.3" WVGA display running with
a blazing-fast Qualcomm MSM8260 1.2GHz CPU, 8MP camera with HD video recording (720p). It'll have an HDMI output with Dolby Digital Plus surround. It runs on Window Phone 7 OS.
The Xperia X7 Mini features the same, it has 1GHz processor, 3.5” 480 x 800 touchscreen, a 10.1 megapixel camera with 3X optical zoom and also you can record HD video(720p) and Xenon flash, and comes with a pair of noise cancellation headphones. It also run on Window Phone 7 OS.
Here is the Leaked video of Xperia X7 And X7 mini: