Erick,
You are correct. When you send an H3D (or other digital backs) to Hasselblad for CCD-related service (cleaning, etc), they will replace the IR filter with the new and improved version. Not sure of the exact cost to you, however a CCD cleaning and filter replacement runs $490 USD.
Regards,
Jordan Miller
David I have heard that the Improved IR filter can be fixed by Hasselblad on H3D for 4 or 500 euro