Info on the Sony Xperia J has leaked before, but now the smartphone followed in the footsteps of the Xperia T (Mint) and Xperia XT (Hayabusa) and got a preview before its official announcement, which should happen at IFA (starting at the end of this month).
The Sony Xperia J borrows design cues from the T and TX, but is a low end device. The screen is a 4" FWVGA LCD, but has narrow viewing angles and isn't very bright, according to Mobile-review's early impressions.
The phone is powered by a Qualcomm Snapdragon MSM7227A chipset (Cortex-A5, Adreno 200, 512MB RAM), the same chipset we saw on the Samsung Galaxy S Duos and other phones (the Xperia miro and tipo use the 7225A version, which has a lower CPU clock speed).
The chipset reportedly offers good enough performance for ICS and the 1700mAh battery is enough for a day of heavy usage but can easily go two days if you don't push it too much.
In the end, the Sony Xperia J seems to offer a very attractive package for its price of €150-160, with good build quality, great display for the class and good reception and audio quality.
If you can read Russian (or you're okay with Google Translate), you can read the Xperia J preview for more details by following the source link.
Source (in Russian)