Xiaomi's 12.5-inch Mi Notebook Air appears to be due for an update in a few days, as evidenced by a post from the official account of the company's notebook division. Teaser poster The post is about as vague as they come but there's a date - March 26 is when something is happening. There's a scale in the teaser image showing 1.07kg, the weight of the current model of the laptop. Our Chinese being rusty, and Google Translate being notoriously unreliable with Chinese to English translations, we can only speculate that the tagline reads something like 'What's the perfect...