The FP enforcement is being reported both by USA today and Fox News. Here is a
link to the USA today article
but what I found most interesting was a comment posted by Len Testa (of touringplans.com). Scroll down to the bottom of the article to find the comments. I consider him to be a reliable source when it comes to predicting wait times, since his experience is based in math and algorithms, and not hearsay or perception.
Here is what he wrote:
"I don't see how enforcing FASTPASS return times will result in shorter lines, as Ian says. For example, morning guests can no longer "bank" the savings they get from obtaining FASTPASSes early and riding late; they have to return and ride during the morning. As a result, there's less time for visiting other attractions in the morning, when lines are low. Every simulation I've run says guests will experience an increase of at least 4 minutes over the course of a day, and the average is somewhere between 15 and 30."
I've also been checking twitter, and there isn't a lot of reports back on what is happening with FP in the parks today. I am a little disappointed, I was hoping for more news.