There has been a late addition to the changes for the upcomming season as the NHL Board of Governors was given conditional approval to implement the verification line in the goal as well as a plastic skirt and a thinner mesh for the net. This is according to TSN in Canada.
The line is expected to be in place by the start of the regular season in all venues whereas the changes to the net will take a few months to prepare, assuming the NHLPA gives its consent, which is likely.
The verification line is a second line that sits inside the goal zone designed to help review officials determine if the puck fully crossed into the goal. The concept is that if the puck touches the green second line, then you know the goal is good.
It is unlikely to save us from any more reviews on goals, it's just supposed to help the officials more easily determine goal or no goal. My initial reaction left me wondering what the difference is in the puck touching a second line or not touching the first line. But then when you realize the red line has a tendency to bleed while the green line will be actually in the ice, it makes more sense. The line will remain straight. The additions of the thinner mesh and plastic apron that will make the big difference in the visiblity.
Here is a little more explanation on the goal verification line from the R&D camp. The shallower nets will not be instituted yet, perhaps not for another year or two until it gets full approval from the NHL and NHLPA.