Hi Mondo,
The licenses for 6.2 are transferrable to 7.0. Remember that they are based upon IP address so if you need to move them you'll have to contact HP Support to get new passwords.
You say you're not moving the current database. I guess this means you're not moving the Cell Manager to the new system. If this is the case then you shouldn't need to move licenses....all the licensing is configured on the CM.
Hope this helps,
John