The feature won't appear until sometime in the "coming months," and Instagram stresses that it'll pay attention to feedback in the process. Only a small percentage of users will notice it at first.

It's a big gamble. Prioritizing posts could help Instagram keep occasional users, who may stop using the app if they don't see their friends' big moments. However, this might annoy die-hard users who want to see everything the moment it happened -- especially since there's no mention of a way to opt out. Remember how Twitter users panicked at the thought of the social network showing tweets out of order? Instagram may well need to take extra steps like this to continue growing at a breakneck pace, but there's a real risk that it'll alienate its most vocal supporters.