The Avon park is scheduled to go in this fall last I heard (a week or so ago). It is being built by Nick Turner and the company he works with riverrestoration.org I think the only thing holding it back right now is easements along the river which are being nailed down as we speak. Once the easements come through, they can start construction, hopefully sept/oct.
As for Vail, there was a meeting last week and it looks like they are trying to do the bladder system as an improvement for the feature there. Sounds like the right people are behind it and trying to push it through, but when that will happen I do not know.
Glenwood is having a big meeting tonight for their park as well and they are trying to get as many as possible down that way to show support.
Hope that helps,