Recently there was a rumor that was widely spread out about Sony Lavender will be called Xperia T4 Ultra. Today another rumor was spread around the world about the same Sony Lavender (E5503, E5563). Device is rumored to have a 1080p Display that is bigger than Xperia C4 and this device will feature a MideaTek (64-bit octa-core LTE) chipset with 2GB RAM and will equip with 13MP rear and front cameras.
This new rumor has information that this Sony Lavender will be named as Xperia C5 Ultra. THis was leaked by the leaker "Upleaks" in his twitter Account. There could be more chance that this info is correct.
Sony Lavender＝Xperia C5 Ultra— @upleaks (@upleaks) July 14, 2015