From these pictures it appears that Sony Xperia SP will have a slightly larger screen than that of Sony Xperia V, which comes with a 4.3-inch display. The folks at XperiaBlog.net believe that Sony Xperia SP may perhaps come with 4.5-inch display. Also from the pictures it appears that Sony Xperia SP will be running on Android 4.1.2 (Jelly Bean)
As per the Android Hilfe forums, the person who tipped them about these pictures also mentioned that the battery of Sony Xperia SP will not be removable. However, the smartphone has a plastic back cover in order to insert the SIM card and microSD card.
From the past rumours, it is expected that Sony Xperia SP will be a mid-range smartphone which will have 1.7GHz dual-core Qualcomm SnapDragon and a 720p display. The smartphone will also support LTE.
It is noteworthy, that a leak of Indonesia's Postel Telecom had revealed that Sony C530X 'Huashan' will be launching as Xperia SP. The same leak had also mentioned that the company is planning to launch another device, Sony Xperia L, which is codenamed C210X.
Given that Mobile World Congress (MWC) 2013 is around the corner, one is certainly hopeful that Sony Xperia SP and Xperia L will be amongst the smartphones that the Japanese handset maker will be unveiling at that event.