HTC is working on a sequel to the Butterfly handset, that, judging from leaked front panels, seems to fit in the niche between the 4.7" HTC One and the monster 6" One Max phablet... The Butterfly 2 is said to sport a 5.2" Full HD panel, similar to the LG G2, and apparently is coming in white, black and blue versions. Snapdragon 800 will be running the show, claims the source, but the kicker is that the whole device will be waterproof, with HTC taking a page from Sony's playbook...
Source: http://www.phonearena.com/news/HTC-preps-5.2-waterproof-Butterfly-2-flagship-colored-front-panels-pop-up_id47840
Source: http://www.phonearena.com/news/HTC-preps-5.2-waterproof-Butterfly-2-flagship-colored-front-panels-pop-up_id47840