The Submit dashboard will allow you to easily see which of your friends are online. You can also easily manage your stable and what stables you're part of. You can also manage your referrals. (Dashboard is not finished 😉)
These are only a few previews of what I would consider "complete" features. I have other builds with a lot more functionality that I'm going to be sharing over the coming months 😀 that dashboard for example doesn't show everything.