Sony just announced in Japan what could be the successor to the XPeria S, the 4.6-inch Sony XPeria GX packing a 13-megapixel shooter and running on ICS.
The body of the XPeria GX is thinner and closely resembles the curved shape of the Xperia Arc S.

Sony did not share full details of the hardware specifications but we can derive a better picture once we combine it with what we already know from the Xperia S.
Sony Xperia GX LT29i specs:
4.6-inch HD Reality Display @ 1280×720 pixels
Mobile Bravia Engine
Qualcomm Snapdragon S4 1.5GHz dual-core processor
1GB RAM
1.5GB built-in storage
16GB external storage (non-removable)
WiFi 802.11 b/g/n, DLNA
Bluetooth 2.1
NFC support
GPS w/ aGPS support
13MP rear camera w/ LED flash
1080p video recording
micro-HDMI out
Android 4.0 ICS
So the difference between the Xperia GX and the Xperia S is the bigger screen, higher MP camera and Android ICS. The only letdown is Sony placed a 16GB internal storage compared to the 32GB on the Xperia S. It’s possible though that they already put a microSD card slot in here.

Do they have plans on selling this here in PH? I’m craving for it.