The Sony Xperia Z Ultra WiFi only model will come with the model number SGO412, this is expected to be the international version of the handset, another model number, SOL24 has also turned up, this is expected to be released by KDDI in Japan.
The WiFi only version of the Sony Xperia Z ultra is expected to feature similar specifications to the original handset, which will include a 6.44 inch full HD display with a resolution of 1920 x 1080 pixels.
The handset will also comes with a 2.2GHz Qualcomm Snapdragon 800 processor, 2GB of RAM and an Adreno 330 GPU, plus 16GB of built in storage.
We are expecting the Sony Xperia Z Ultra to also come with a microSD card slot for expansion, and front and rear facing cameras.
The original handset comes with a 2 megapixel front camera and an 8 megapixel rear camera, it will also probably launch with Android Jelly Bean.
Source Xperia Blog