Due to similar screen size the the Xiaomi Redmi 1S (Review | Pictures), the 4G smartphone on Tenaa which is listed as 'Millet 2014811' (translated from Chinese) is speculated to be the Xiaomi Redmi 2, or possibly the 4G variant of the Redmi 1S, just like Xiaomi Redmi Note 4G (First Impressions).
From the looks, the unannounced Xiaomi handset listed on Tenaa appears to be very similar to the Xiaomi Redmi 1S, with similar old-school design, but there are few changes in terms positioning. The camera LED flash and speaker grill at the back has been repositioned. Also the front three capacitive buttons appear different in the Tenaa images.
Overall, the smartphone is a bit more compact than the Redmi 1S, as it is listed with dimensions 134x67.21x9.2mm, and also weighs 26 grams less with 132 grams instead of the 158 grams of Redmi 1S.
Other specifications of the alleged Xiaomi Redmi 2 listed on Tenaa include a 4.7-inch HD (720x1280 pixels) display, 1.2GHz quad-core processor; 1GB of RAM; 2-megapixel front-facing camera; 8-megapixel rear camera; 8GB of internal storage expandable via microSD card (up to 32GB); 4G LTE connectivity and Android 4.4.4 KitKat.