They have two versions of Xiaomi mi3,
one is with Tegra 4 at 1,8 Ghz and the other version
with Snapdragon 800 at 2,3 Ghz Adreno 330.
Not exactly new news this was reported on almost a month ago http://www.gizchina.com/2013/07/05/xiaomi-mi3-tegra-4-1080-display-benchmarks/
Doesn't make sense for them to go with a Tegra 4 processor. They've had so much success going with Qualcomm's Snapdragon line. :/ also, that would make it at par with what the current Xiaomi Mi2S already offers.
I hope this isn't real and that we'll find out the real specs in two days' time.
Xiaomi Mi3 has awesome specifications and it will definitely sell like hotcakes in China if they get the price right.