I recently came across a graphic designer's website which had a few proposals for marketing material/branding etc. Among these was "Lancaster Green", which is described as
Marketing and promotion for the development of Lancaster Green, an eco-friendly urban park located outside of downtown Fort Worth, TX.
The location of this proposal is between 30, Lancaster, Lamar and Henderson, and would be partially set below the onramps onto I-30. This plot of land had been listed in past Downtown FW Inc. proposals for more park space in long-term master plans, so this strikes me as something that could likely be in the planning process. The concepts in the website are all very professional as well. The website uses June 2015 as an opening date (which I'm sure is just there for concept sake) and the copyright on most of the pages is from 2014, so this is something that I'd guess has been in the works for a while.
Here's a proposed logo,
And here's a layout of the park on the site
The idea of a new park in the location isn't stellar, being surrounded on most sides by roadways and the nearby land isn't great for development, but it could be of benefit to both the T&P warehouse and the Public Market. The park would be quite large and the multiple uses, including dog parks and performance area, remind me a bit of other park developments such as Klyde Warren or Discovery Green.
So all in all, don't know how serious this all is or when it might come to fruition, but this is no doubt something that's being planned so it's something to keep an eye on.