I started writing one for iOS, using a game engine to get some really rich effects, but JIRA changes very quickly and I always found myself in their web interface rather than using what I had written. I am in the Atlassian ecosystem myself.
Honestly probably not as all client interfaces I've tried end up lagging behind the web or not having all the features. It's a huge undertaking to recreate JIRA in a client.
Personally, I wouldn't be. Just adding a voice :) The web interface is good enough for me.