BOTH ways, actually...I myself, was already an existing sub, & I was actually in mid-contract with my last legacy DVR upgrades...
Here is what I think is stupid about this SJ...
OK, so they stick 2 tuners in this thing & it integrates them into the Hopper & all...but WHY didn't they just go ahead & put in a 3rd tuner while they were at it? I mean, when you use a Duo Node for a H/J system, you have 6 sat tuning streams available anyway...& you CANNOT use any other type of (single-tuner) receiver on the system anyway. So now, they basically left 1 sat tuning stream "hanging out" there, with no way to use it. Putting a 3rd tuner in the SJ would have enabled that 6th stream to be utilized, while one-upping DirecTV on their 5-tuner DVR.
Because the Moca is only capable of 5 (or 8 with PTAT) feeds on a single Hopper. That is probably why there hasn't been integration on 2 Hoppers.....