Way back two years ago when XBox One was announced, there were quite a few questions about hobby and indie development on the platform, especially considering how they opened up the X360 with XNA. One discussion. Another. Another. Another.
Much of the speculation two years ago came from press releases from that time showing Microsoft was committed to both independent and hobby developers. There were comments by Microsoft that these features were important but probably would not be launch features. There were even links to Microsoft requesting feedback from small but established teams soliciting guidance based on their experiences with XNA, the Creators Club, XBLIG, and the rest.
Coming just over a year after the platform's release: "Microsoft is planning to detail its plans fully at the company’s Build developer conference in April, but we understand they’ll involve allowing developers to turn retail Xbox One units into developer kits."
The article talks about "planing to open up ... in a big way this summer", publishing an SDK in similar fashion to the way they launched XNA (with pilot developers first). They mention a tech preview will likely be made available at the conference or later in the summer, and claim "developers will be able to submit and publish apps in November ".
The timetable works out close enough. For those who remember, XNA Game Studio was given to several pilot groups first, then had a tech preview release at a major conference, and finally then launched to the masses December 2007, two years after the XBox 360's November 2005 public release. November 2015 is two years after the November 2013 XBox One launch.
This type of pre-announcement authorized "leaks" are quite common to generate hype before a large event. It matches close enough with prior statements, and the timelines both for the product and for pre-event hype building also fits well.
Assuming the article is accurate, this could make for some exciting times for the console.