It is a good reference. Quality stuff, Rich. As you suggest, it almost certainly will be a topic of conversation here.
Your assessment of the three players in terms of alignment is reasonable although coverage could vary widely. In general, it is true that the X is viewed as the No.1 WR, which often reflects big play ability as much or more than number of receptions. It also is true that the X most often is covered by the opponent's best CB, and if he represents a real threat, he may see double or bracket coverage.
As for Manningham in that context, I view him more of up the field X-receiver than route-savvy Z.
But whether the X, or Z sees m2m or zone, press, squat, or off depends on the nature of opponent's defense, and game plan. Moreover, even when the CB presses, it doesn't automatically mean he's playing Man. If the X makes an inside move, and it's Zone, the CB may pass him off. We saw quite a bit of that from Seattle in the SB where their press Cover 3 may have been a counter to Denver running 2x2 and 1x3 sets which they often use to try to exploit m2m coverage with a pick play.
I too will be interested in who sets up where and with how many WRs, and how often. We then may get some idea as to whether there will be a meaningful increase in multiple (3 and 4 WR) sets which might be a first reflection of the difference between the Packer's pass offense and the Giants which otherwise is not all that different. For example, over the past couple of seasons, GB passed out of 3 and 4 WR sets almost 90% of the time compared to the Giants 73%. While the Pack passed with 3 WRs about 65% to the Giants 60%; they used a lot more 4 WR sets, 25% to the Giants 10%. Perhaps, we will see a bit more in the way of twins and trips.
We know, of course, that TC has never been comfortable with 4 WR sets for reasons of pass protection ever since Eli's has been his QB. That must have been a factor in countering Gilbride's instincts toward the wide open and multiple. Will it be any less so now?
As for motion, neither the Coughlin/Gilbride Giants or the McCarthy/Clements Pack have employed it.
I'm sure that they will try to get the Backs more involved in the passing game, but even so the biggest benefit to the passing offense would result from a solid improvement in the running game.