NVIDIA have finally started discussing Tegra 4 or "Wayne" in more detail, as well as covering Tegra 3+ at HTC's Freqs event in Seattle on Thursday. NVIDIA didn't give much info on it, but we should expect a clock speed increase or other minor updates to the chip.
Another device 'Grey' should also launch side-by-side with Tegra 4, and will be the first Tegra-based device to sport LTE support. It would also be the first device from NVIDIA to benefit from the company's acquisition of Icera. Original roadmaps pegged NVIDIA to hit up to 2GHz for the Tegra 3+, but the newer roadmaps point to it hitting mid-range smartphones rather than high-end devices.
Tegra 3+ devices should be made available by the end of this year, but Wayne and Grey are not expected until next year. Android- and Windows 8-based devices should sport the ability to have Tegra 4, but Grey is most likely going to be limited to Android. It will be good to see what NVIDIA can do for Windows devices, I'm getting more excited by the day for smart devices with news like this.