It's simply a name change. And, for what it's worth, it's not really consistent with how the fees show for VIP model receivers. Not saying it's good or bad, but the fees themselves haven't changed. A couple of examples:
Customer #1 has VIP equipment. He has a 722K and a 211K, powering 3 televisions. His fees will be;
$7 DVR Service Fee
$7 Solo HD receiver.
The first receiver is "free", and the customer gets charged a $7 DVR fee if they have that single 722K, or if they had five of them. Admittedly, if they did have five 722K receivers, they'd pay a $7 DVR service fee, a $17 Duo DVR, $17 Duo DVR, $17 DuoDVR, and $17 Duo DVR.
Customer #2 has a Hopper and two Joeys.
Old bill:
$12 DVR service fee
$7 Joey
$7 Joey
New Bill:
$12 Hopper receiver
$7 Joey
$7 Joey
Customer #3 has two Hoppers and 1 Joey
Old bill:
$12 DVR service fee
$12 Hopper (Hopper #2)
$7 Joey
New Bill:
$12 Hopper (Hopper #1)
$12 Hopper (Hopper #2)
$7 Joey