Sony Mobile has another entry level Xperia model on the cards judging by the Indonesian Postel regulatory site. Two variants of the Sony D25XX model has appeared, including what appears to be a LTE D2533 and HSPA+ D2502.
This follows on from the Sony D2403 model that we saw leak in a benchmark recently. So either the D25XX is a separate phone with slightly better specs, or given the close model numbers it could be that one is a single SIM version and the other a dual SIM variant.
According to the leaked benchmark, the Sony D2403 will sport a 4.4-inch qHD (540 x 960) display, 1.2GHz quad-core processor and Adreno 305 graphics, 1GB RAM, 16GB internal storage, a 8MP rear camera and VGA front-facing camera.