The firmware version should be accessible from the left side panel under the About page. The latest app also displays the hardware version (latest firmware required).
We have an upcoming feature that will detect the current firmware and latest firmware and notify the user with a change log within the app if there is a newer version. This is already complete and will be included in the next app released.
An SD card based firmware update is not possible on the current hardware however remote upgrade options are being considered.
Thank you and Happy New Years to you as well!