Insta360 has released a new teaser for a launch event on April 22 It has the tagline "all day, all night, all angles" and hints at a new 360 camera Recent leaks suggest it's preparing to launch the Insta360 X5 Insta360 has long topped our guide to the best 360 cameras – and a new teaser suggests it's preparing to launch a new flagship model. Fortunately, some recent leaks have also given us an idea of what to expect, with a successor to last year's Insta360 X4 looking highly likely. The X4 was only launched a year ago in April…