Looking on their site it looks like you will have to wait. Unfortunatly no time frame mentioned as to when it may be available.
If your laptop is capable of supporting a second hard drive (you may need to contact Toshiba) if it's not in your documentation, then you could install XP on the second hard drive to use with your Casio unit.
If you go this option, you can post again for help on dual booting with XP installl after Windows 7.
Do you think they will eventually have the driver?