How many colors are there in total? I heard there are rose, mandarin, blue and black... Any more colors? Also, is this suppose to be a permanent item in LV or limited edition? If it's limited, how long will it be available for? I know the size is 4" x 6". The size is indeed very convenient to be carried around in our bags... but will it be too small to be a practical agenda? Please do share your opinions..!