WP8.1 may require higher Class SDCard & some bad news for budget Lumia owners

As we are closing to the Build 2014 where Microsoft is rumored to announce the first major update for Windows Phone 8 devices. The new update will bring lots of new features including the capability to install apps to MicroSD Card. Of Course developers will have a option, whether to allow the installation of apps on SD Card or not.
Today, NPU reported that this feature will require some special requirements. According to them a minimum of Class 6 SDHC card is required, with Class 10 recommended. Class 4 and below will not be supported, with the OS automatically detecting the speed on insertion. If the card is too slow users will not be offered to move apps from the phone to the card. The requirement should also help users avoid performance issues when saving video to external cards, which can be stuttery when bitrates are high.
They also confirmed that three-column live tile support will be available for phones having the physical screen bigger or equal to 4.5 inches. That means budget friendly Lumia devices like the Lumia 520,620 and 720 will not have this feature.