Me personally, when i saw "Guild Housing & Property" listed as an intended feature down the line it really got me excited. A big part of what makes MMOs so great is the ability to personalize your experience and cater to your own style and image in-game, and having a housing system where we can customize our "homes" seems like such a great way for us to express ourselves, while also giving the devs a way to reward us with cool cosmetics we can earn. Not to mention it would make for a great money sink providing us with tons of furniture to buy to keep the economy thriving. This is an area were i feel a lot of other pokemon MMOs have not taken advantage of to its full potential. Everyone loves to customize their character with their favorite clothes, so being able to do so with a home just adds a whole new layer to it.
Also the "Pokemon Needs System" caught my eye as something that could be very interesting. Potentially having to care for our pokemon on a deeper level than the traditional system. I could see that as making our teams feel more like pets that we need to care for, rather than monsters we only use to battle with.