Details about three of NVIDIA's upcoming Tegra 3 SoCs have appeared on the web, and also notes that the first handset with Tegra 4 (aka Wayne) will be available towards the end of the year. Wayne is based on the ARM A15 architecture and will be announced at or around Computex in June. Full details over here.
The AP37 which is a faster version of the AP33 which is currently found in most high-end Tegra 3 handsets. As you can see, clock speeds are set to be increased, but sadly we don't have an exact figure although nVidia is targeting 1.7GHz for the high-end parts with the possibility of some slower 1.5GHz parts. Note that the 1.7GHz speed is only likely to be single core clock speed, but we haven't managed to confirm this.
The GPU performance is also said to be boosted by about 25 percent and this has simply been done to be able to drive higher resolution displays as the market moves towards full HD and beyond for high-end tablets and smartphones. Yes, you did read that correctly, smartphones are expected to get 1920x1080 or 1920x1200 displays this year and we know of at least two, if not three panel makers that are already busy churning out displays and it's likely that there are even more companies working on it as we speak...