A week ago I did troll around the obvious possible sites on my way from Hanover to Mass, but I didn't see any construction:
Take I-91 south to exit 11, Rt 5 in WRJ. I explored from the Rt 4 junction to the north, and south to under I-89 (past the VA hospital). After 89, it gets pretty desolate (not a likely spot). I also drove down Sykes Mountain Ave, past the McDonald's, Bus Station, etc until it became residential.
The one long strip mall of 12A, from Home Depot north to the Powerhouse Mall. I also checked out Interchange Drive (the loop "around back" from Walmart to McDonald's, where the Valley News offices are).
I went up Benning Street behind the Shaw's (I little too industrial, and a bit of a walk to amenities).
At the Powerhouse Mall, I turned up Glen Rd and went to Rt 10, and drove Rt 10 past the movie theater and Price Chopper, and got on 89 south.
Personally, I think #2, somewhere on 12A makes the most sense, since there is the most to do (even if the incentives are better in VT). The detour off I-91 is <5 minutes at most.
I did look around the Hartford, VT (WRJ is part of Hartford) and Lebanon, NH web sites (specifically planning board pages) for any docs of interest, but didn't see anything.