Yesterday, Twitter moved in on Instagram territory by adding filters to its mobile apps. Not long after, Instagram announced an improved app. Coincidence? Who knows. We suspect it isn't.Instagram upping its game in response to the new competition certainly isn't a surprise. But its speed of response certainly is. That response is a new iOS app called Instagram 3.2, described as the 'largest upgrade' to the iOS camera in over a year. Plenty of substance to back up that statement too.You'll now see an Instagram themed shutter and shutter release button, a preview of your most recent photo on your camera roll, an improved camera roll image selector for quick access to shots, an optional grid guide for live photos, a permanent grid guide for the scale and crop screen and finally, speed and reliability improvements. If that's not enough, Instagram has also thrown in a new filter, with Willow described as a monochrome filter with 'subtle purple tones' and a 'translucent glowing white border'. Look out for that all over your feed this Christmas.Last, but not least, Instagram has tweaked the look of its news feed and is now saving photos in a separate album called Instagram in the iOS camera roll. It also has some compatibility with Foursquare integrated into the app, perhaps to make up for the decreased co-operation with Twitter.If all of that appeals, the app is ready and waiting for you.