According to the recent press release the SD card association assigned a new high-performance option and symbol specifically designed to support a wide array of 4K2K television and video products. A new Ultra High Speed (UHS) Speed Class 3 (U3) symbol will indicate products capable of recording 4K2K video and will operate exclusively on SDXC UHS-I and UHS-II memory cards and devices and SDHC UHS-I and UHS-II memory cards and devices.
A new high-performance option and symbol specifically designed to support a wide array of 4K2K television and video products. A new Ultra High Speed (UHS) Speed Class 3 (U3) symbol will indicate products capable of recording 4K2K video and will operate exclusively on SDXC UHS-I and UHS-II memory cards and devices and SDHC UHS-I and UHS-II memory cards and devices.
see more details at the press release here – New SD Cards can record 4K Videos
