Karma system / profile decoration?

Any plans for total upvotes to be displayed on our profiles? potentially with profile perks/medals as rewards for milestones or special events?

I feel like even a barebones implementation could be a massive boon for user retention, as probably the main reason I started using reddit regularly was because it was so satisfying seeing my profile karma grow, but maybe thats just my ADHD brain talking.

(also a site wide karma leaderboard would be cool ;P)