Nvidia has perhaps inadvertently revealed that the next Nexus tablet will be made by HTC. As part of a document relating to their patent lawsuit against Samsung and Qualcomm, Nvidia has mentioned that the HTC Nexus 9 will launch in the third quarter of this year, powered by a Tegra K1 SoC.
If Nvidia is correct about the Nexus 9's third-quarter launch date, one would expect it before the end of September. However, with HTC hosting a "double exposure" event on October 8th, it might still be a month or so before we see the tablet for the first time, assuming the event is used to launch the Google-backed tablet.
Previous rumors have indicated that the Nexus 9 will feature an 8.9-inch display, possibly with a resolution of 2560 x 1600, as well as an 8-megapixel rear camera. It could also be the first device to pack the 64-bit variant of Nvidia's Tegra K1 SoC, which includes two custom-made Denver CPU cores alongside their mobile Kepler GPU.
The Nexus 9 will most likely launch with Android L on board, although as Google hasn't as yet finalized the upcoming version of their mobile OS, its release will hinge on when Google Android L is ready.
The release of the Nexus 9 will be the first Nexus release of the year, following on from last October's Nexus 5 and the mid-2013 launch of the second-generation Nexus 7. Hopefully it won't be too long before it's seen in the flesh.