Poinciana is a very interesting place. The residents come from all over the world. I've personally met people from South America, Eastern Europe, Canada, and other parts of US such as New York City, Colorado, Oklahoma, and Georgia. I had many interesting and friendly conversations with these people. It's a fairly safe and clean place to live.
I know many international investors bought houses there in the past few years, including those from Canada, New Zealand, Great Britain, and China. The price has gone up in the past few years. New roads, new parks, and a new hospital are being built. There are also several new stores that opened recently.
If you really want to walk to stores, you could buy a house at Village I and walk to the Publix, a few restaurants, two barber shops and a hair salon, the library, and the post office. However, since it could get very hot in the summer (as in other part of Florida), walking to store in the summer may be difficult (depending on your health). You could bike or take the bus, though.