Paul O'Brien is a pretty well-known developer within the Android community and he has been known to get some leaked intel correct from time to time. He just tweeted that he received an anonymous tip regarding the upcoming Nexus 9 tablet. Supposedly, it will launch on October 16th.
It's important to note the word "launch" in this regard. If this tip turns out to be accurate it is probably meant to portend the actually retail street date of the product. Most of the solid intel we have received up until now has suggested Google will reveal the Nexus 9 and other Android L products on (or around October 8th).
We will keep an eye out for anything corroborating this rumint.
Source: Twitter