Among the options in this S40 version of Nokia Store include a section listing trending apps, fast download feature, and information on whether an application will make use of your personal data, or if it includes in-app purchasing.
Note that this preview is only available for S40 touch-and-type devices:
Nokia Asha 202Nokia Asha 203Nokia Asha 300Nokia Asha 303Nokia C2-02Nokia C2-03Nokia C2-06Nokia C2-07Nokia C2-08Nokia C3-01Nokia C3-01 Gold EditionNokia X3-02
You should not attempt to install the Nokia Store app unless you are using one of these devices.
Nokia Store is an interesting sneak preview of how the store will look in future. It's worth trying, but it's not a full, stable release.