Ah, found it. It was in a post on the TL forums by BlackBlade:
"T4 is launched, it takes longer than the previous version updates as its one of the larger updates. They are also hindered by the rapid growth of Legends and what they did to get there. Naturally after T4 they look to T5 and end up going too far for most of the community, requiring a spin off. The T5 update was designed to revolutionize the game and even add the much request mobile app. The level of change would naturally see T4 wound down over the next couple of years. The over extension from the previous years, changing face of the gaming market and poor reception to T5 result in big layoffs as the company seeks to stay afloat."\
2015 - Present This period marks a turn around for the company. There are a ton of changes at all levels of company over this period but it starts with change in CEO. The company works to stabilize revenue, rebuild the Legends team that they had only recently expected to shutter. The company enters the publishing game to generate more revenue at lower cost. In 2017 the new tribes debut, a community request 10 years in the making. 2018 sees another major community request in PtP. 2018 also sees the start of major community outreach through the Legends on Tour event, which is built on significantly in 2019. They finally begin the undertaking of untangling 12 years of code to improve the user experience, enable mobile functionality and open up new possibilities. In short the game and wider company undergo a major transformation, one that is still in progress."
That last part obviously referring to Legends, not Kingdoms.