Do you know any updated Photoshop template for icons needed for AppStore ? I mean template with icons for newest devices fe. iPad mini ?
What specific "Photoshop template" are you taking about? I know of none. Icons are the same size across all devices.
You can download the template from here: http://www.pixelresort.com/blog/app-icon-template/ It has all required resolution and will save the icons at the desired size.