I just got the news too! Be still my heart!
NASA was going to launch a seismograph to mars this month, the only window they would have gotten this year, because the seal on their drilling probe was not withstanding their stress tests. This would have been a critical error as no one would have been there to fix it if it could not withstand the pressures of the martian planet's core temperature. So I respect their wishes to withdraw from the launch.
Nintendo I also trust. While they have lead me to disappointments in the past, much like NASA has, I trust that their reason for withdrawing was a good one, much like the reason I discovered from the NASA launch. Even though, Nintendo isn't sending expensive equipment to space, they are certainly a company that works very hard and loves what they do. I'll do more research to see what's going on and let you know what I find.
This 2017 date seems like a soft date, from what I've seen so far, but it's a date I'm not happy about seeing, none-the-less. I am still looking forward to their GDC reveal and desperately hope they will give more information as to why they didn't launch this year.UPDATE:
The GDC reveal has ALSO been canceled. I'm so upset... However, Niantic Labs said they canceled their appearance at GDC so they could get back to working on the game and beta testing it. This is so disheartening, but I'm going to try to follow it as closely as I can.UPDATE 2:
Okay, so it seems the date being changed to 2017 is NOT solid at all. In other-words, it could be a rumor, as it's not been confirmed to actually having been moved.
The Japanese Pokemon Go website still says 2016, AND Beta Testing in Japan has been scheduled for the end of this month. The developers still will not be attending the GDC, however. For more information, you can look at the Japanese Pokemon Go page (you'll need a proxy to view the page if you're in the US and a translator if you can't read Japanese), and even look at the Team Atlas Go webpage
or Team Atlas Go youtube page.