I checked the zoning on e-maps and it was zoned "O1O SUBZONE- Trans Canada Pipeline Subzone", so I guess that's it... a google search shows that there was some Stittsville pipeline project in 2006 (thanks for the date on those images)
I agree about that subdivision. there's almost a ring of them around Kanata and Stittsville.
March Rd and 417 is seeing more exurban development. the expansion of the golf course on March Rd SW of the 417 is carving a big chunk out of those woods. There's the Carp Airport development, a recent estate lot subdivision (country meadow drive) and this
proposed/concept golf course/hotel/waterpark,