Yesterday, photos were posted to Twitter revealing the Galaxy S4 Mini. However, another image was posted to Twitter today reportedly revealing four Galaxy S4 Mini model listings on the Samsung support website.
Italian publication Android Caotic (source below) reports that the GT-I9190 is the standard Galaxy S4 Mini model while the GT-I9192 is the dual-SIM version. The GT-I9195 is reportedly the LTE variant and the GT-I9198 seems to be a model being made for China.
This, of course, has not been confirmed by Samsung, so it'd be best to treat it as a rumor for now. On the other hand, it would be highly possible that four Galaxy S4 Mini models exist considering Samsung often makes multiple models for different markets.
According to SamMobile, the Galaxy S4 Mini is expected to have a 4.3-inch Super AMOLED qHD 960 × 540 display with a pixel density of 256ppi. It is also said to have a 1.6GHz dual-core processor and is running the latest version of Android, 4.2.2.