It’s obvious that NVidia is already planning an update for it’s
SHIELD media player. Now it seems real as Amazon unvoluntarily
leaked information about the upcoming SHIELD products. There
will be a box and a “stick” both equipped with the Tegra X1+ CPU.

While the price for the box is announced with 199 US$. there are no specs for the Stick yet which looks like a tube-shaped battery pack.

And the NVidia Shield Stick: