This conveniently rolls out at around the same time as sponsored updates. It's important to note that there are a lot of Instagram clients on Windows Phone already including the more popular 6tag (http://www.windowsphone.com/en-us/store/app/6tag/7d795cdf-fb...).
One of 6tag's features is supposedly 'hide sponsored posts (beta)' which really highlights the urgency as to why Instagram would need to build their own client.
One of 6tag's features is supposedly 'hide sponsored posts (beta)' which really highlights the urgency as to why Instagram would need to build their own client.