Meizu are not lagging behind and delaying with any updates nowadays. Keeping up with this, they have recently launched Flyme ROM update based on android 4.4 (KitKat) for its Meizu MX3.
Flyme 3.6.2a is the second in the series of 4.4 based update and is ready for download now. It is to be released on the flagship Samsung Exynos Octacore smartphone. With alteration made in the music, video, browser, contacts and Bluetooth apps, this update is merely a bug fix.
Even though I have not yet tried the android 4.4, it is claimed by the critics and users to have a greatly improved battery life and performance.
Apart from this, the other highlight by Meizu is they are close to breaking a 1 billion downloads record from the app store. [source]