In my post about updates I go into some detail about the current state of the game's code and how that can restrict future content updates. All of that is still true, however there are some forms of additional content which may or may not stretch things further, it's just hard to say.
I don't want to get anybody's hopes up, but I also don't want to rule out future content updates altogether. I'm really glad everyone is enjoying the game so much and I've seen some folks get very excited about some ideas, so I want to give everyone a space to throw those ideas out for consideration.
I won't confirm or deny any ideas explicitly, and I won't be providing any sort of timeline either. I'm sure you've all thought up dozens of completely worthy ideas for inclusion, and I also happen to have a mile-long wishlist of my own, but it all just comes down to viability, my ability, and my time.