Samsung Galaxy more big screen devices

The first is codenamed Galaxy Mega 5.8 with a model number GT-I9152. Obviously, we are talking about a handset with 5.8-inch display and the model number pointing to its dual-SIM nature.
More interestingly, the second one is carrying the codename Galaxy Mega 6.3, which hints at a 6.3-inch display - the same as the Galaxy Note III is rumored to pack. However, the model number GT-I9200