Yeah, I'm pretty sure Ryan is still all for adding investing. Not sure when its coming out though, he seems to be preoccupied with Vault (his other project)
Investments are actually one of the core features of Vault. From what I understand MoneyPot will migrate to Vault for bankroll and user balance management once it is stable enough. Other sites gambling sites will also be able to use Vault in the same way.
Just like MoneyPot, Vault is open source, so you can inspect the code and follow the progress on its
GitHub page, if you're curious.