The EXIF data show that the device used to take the photos was the Samsung GT-I9505 which sounds like the international version of the Samsung Galaxy S IV. The data also show that the resolution on the newer pictures is 2322 x 4128 which does show that a 13MP camera could have been used. We should point out that EXIF data can be faked. The Picasa account is under the name of Su Ya and the subject of the pictures says "Test," which would make sense if these are indeed pictures taken while testing the camera on the phone.
As we alluded to earlier, the quality of the pictures is not good, to say the least, but even if the shots are from a Samsung Galaxy S IV, it certainly wouldn't be the final version yet and some tuning up of the camera sensor still could be on Sammy's "Things-to-do list".
source: Picasa via RedmondPie