I wasn't able to get back to the current fields they're thinking of turning into the garden/farm but I highly, highly doubt it's organic right now based on what I've seen from the ground and aerial images. If it's conventionally cropped right now, it'll take a LOT of time, work, and money for that to become an organic farm.
What are they going to do with it for the first 10 years if they can't sell it as organic?
Heck of a "conservation plan" by destroying prairie and forest and building houses and roads. Conservation is normally the opposite 
My unspun interpretation.
I know it's the top of the Black Earth Creek watershed, and I am pretty sure farmers have allowance or leeway for dealing (altering or construction on or near) with wetlands others don't. Add that "conservation" and "green" are great words when somebody's put lipstick on a pig and your job is to sell it.
Cities all over have to do the development more than ever if not doing drastic cuts because of the state law limiting property taxes. Thus, I'm sure this will happen.
Let's keep the good dialog started with the land owner, other city staff, and other outdoor interest groups. The land owners and officials have said there would be compensation if the bike park skills and jump are is changed. Let's keep at that. The land owners are interested in trail development, and don't forget the part of the article stating how much won't be houses.