@ FearfulSPARTAN: The Xiaomi Mi3 Tegra 4 design win with China Mobile is pretty big news for Tegra 4 for a variety of different reasons. Xiaomi is one of the fastest growing companies in history ($10 billion valuation after only three years in business). China Mobile is the world's largest wireless service provider. And the system performance of the 1.8GHz Tegra 4 variant in this smartphone form factor appears to be very good even compared to the 2.3GHz S800-8974AB variant (even though the latter does have better GPU-centric benchmark performance):
Antutu: 36582 vs. 36026
Quadrant: 18702 vs. 18975
Geekbench2: 4106 vs. 4139
So what is the difference between Tegra 2/3/4 vs. Tegra 5 "Logan" and Tegra 6 "Parker"? The difference is that, with Tegra 2/3/4, there was only one primary design team working with a less-than-modern GPU architecture. So, after Tegra 2 was done, they started Tegra 3, and after Tegra 3 was done, they started Tegra 4 (all the while having strict SoC die size area requirements to keep production cost low, and all the while being unable to heavily leverage existing modern-day GPU assets). Starting with Tegra 5 "Logan" and Tegra 6 "Parker", NVIDIA is designing two modern-day SoC architectures at the same time. This will make a big difference in both performance (with a modern-day GPU feature-set) and time-to-market.
When Tegra 5-powered devices first come to market (which should be as early as Mar-Apr 2014 since the "Logan" SoC started sampling in ~ June 2013), the peak GPU performance of Kepler.M will be unmatched in the ultra mobile space in my opinion. I do not believe that this level of peak GPU performance will be matched in this space until a somewhat mature 20nm fabrication process in the second half of 2014. And right around the corner in 1H 2015 will be Maxwell.M GPU and the circle will turn again in NVIDIA's favor. So instead of being one step behind with respect to GPU performance in the ultra mobile space, they will be one step ahead starting with Tegra 5 "Logan". The writing is on the wall so-to-speak.