The Nokia Lumia 521 features a super sensitive 4” touch screen, 5MP camera with auto focus and 720p HD video recording. It will also include exclusive Nokia applications such as Nokia Music, Cinemagraph, Creative Studio, Panorama, Smart Shoot and HERE Drive, Maps and Transit.
The Lumia 521 is set for an early may release, and is expected to be sold nationwide by Walmart. I believe low end devices like these are the route to go when you want to get a formidable stand in the market, because phones like these will be cheap and readily available (it is a boost for windows phone), next step would be to get low end WP8 phones to other major carriers (At&t and Verizon)
Let's not forget the new and easy-to-afford (without commitment) mobile plans that T-Mobile put out, that should help getting these type of phones really affordable