Peak has an answer to that. Electronic paper display allows you an adjustable 2 character personal ID and also displays 4 digit free-capacity in MB.
The cards will be available in 1 and 2 GB with reading speeds of 13MB/sec, a writing about 6, which is the ultra speed class. The SD card with 4GB capacity will be slower, and will fall in the MLC/SLC speed class.
Peakhardware link.