Oh, this is actually very simple. The Priv was built with 5.1.1 - it's not being "updated" to that and it is a newer device, so it should have more updates further into the future than the Note 4 will see. That said, Samsung has already said they will update the Note 4 and Note 5 to 6.0 - it just hasn't happened yet. It takes time to develop an OTA and even longer to develop an OTA for carrier specific devices. The Note 4 being on 5.1.1 (highest version prior to 6.0) at this point is perfectly acceptable and expected. The Priv starting on 5.1.1 only makes sense because they built it on that, though it would have been better for them to release with 6.0. Verizon has absolutely nothing to do with what software COMES on a device, and they have almost nothing to do with which devices will ultimately get updated - if Samsung pushes an update to them, they have control over WHEN it will be released (because it is dependent on their internal certification) but it is very rare for Verizon to cancel an update that the OEM sent to them for testing.