Model number to Dxxxx model 2014 Sony Xperia smartphone

2014 model of Xperia smartphones Sony Mobile Communications is developing it was found that the model number is the Dxxxx. Model number rule has been changed from the 2013 model, which has been a Cxxxx in 2013. Expected in 2014 Dxxxx Given from this model number rule, a Exxxx 2015. In the model number rules that apply to smartphones, this does not apply as far in tablet devices. I suspect Xperia smartphones of 2014 will become allocation model number of high-end model D6xxx, mid-range model and D5xxx.