The xperia TX mostly will start selling at the end of december...
This is the answer i got from sonymobile:
"In response to your query we would like to inform you that with regards to this matter, kindly note that the Xperia TX's tentative date of release will be sometime towards the end of the year. And since the Xperia J is already in the market, the Xperia TX will be expected to be out anytime afterwards."