The rig was gone last Friday so I imagine it's in line for frac and completion. Maybe XTO will finally report some of their wells after the XOM deal gets done in late June.
Seems to be pretty standard procedure. O&G will often get the permit approved and even commence drilling while they are still working on getting additional acreage leased. Once the full acreage is leased and (usually) before the well's production is released for sale, they will put in a new permit with the revised acreage set as close to that 704 limit as possible.
O&G then has the benefit of holding a larger amount of acreage with that one well.
Mineral owners individual interest in each well in the unit ends being diluted by the large unit size but, in theory at least, it would balance out in the long run as the larger unit would generally allow for more wells in the unit to be produced.
As long as the O&G does continue with the in-fill production plans and not just get one well going and then hold the acreage HBP indefinately it could even be benificial to be diversified over more wells in the long run.
My experience is for the unit size stated on DOs to not necessarily be terribly accurate - usually in the right ball park but sometimes hardly exact - most off I've seen in my own was about 30 acres. What's your experience?