I've read that they will soon extend 121 through Fort Worth to Cleburne to reduce traffic on Hulen and other thoroughfares. I don't think it will affect the traffic on Hulen adversely. I actually think it will lessen it. Here's some more info on Chet Edward's website for your information (see link).
That is something that I have not heard about. I believe it is highly unlikely.
I suggest that you contact the City of Fort Worth and ask that question for an accurate answer.
Please feel free to contact me for any other questions. I will try my best to answer.
Keller Williams (Hulen Street office)