@SlackHQ Could you please revert the regression about not being able to use icon_emoji for bots. All of our notifications look the same now. This was a useful feature. No, we can't set up a token for every kind of variant of a notification. kthnxbye
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In the incoming webhooks setup it states that you can override the icon, channel and username. It has been like that until today when all of our notifications got a default ghost icon ignoring the icon_emoji settings (username and channel still works)pic.twitter.com/6viVOHYMx2
We apologize for the inconvenience this is causing you and your team. Please know that this is a bug we're investigating. 
Thank you for your patience!
references webhooks' part of an app, and that behavior never changed (you cannot override icon/channel/username). As for using custom webhooks, right now we have a bug about icons not displaying correctly for custom apps and integrations.