The second iteration of Microsoft's Surface Go tablet is on its way, and it just passed through the FCC. You can check out the filing here (spotted by WinCentral), and the product is only known as Portable Computing Device; however, the hardware version is listed as EV2, which is the same as we've seen from some Surface Go 2 leaks.
As for what to expect from the Surface Go 2, it's going to be very similar to the original, as second-generation Surface products tend to be. Historically, it's the third generation where the real change happens, as we've seen from Surface Pro 3, Surface 3, and Surface Laptop 3.
The Surface Go 2 will likely be mostly a spec bump. We're expecting the base model to include an Intel Pentium Gold 4425Y, which is a modest bump from the Pentium Gold 4415Y we saw in the original model. But rather than being from the Kaby Lake family, the new model is from the Amber Lake family.
There's also a higher-end model expected that will include a Core m3-8100Y, which is also from the Amber Lake lineup. It's a much more expensive part though, costing about 65% more according to Intel's listing. This version might be reserved for businesses.
The Surface Go 2 is expected to be announced soon, alongside the Surface Book 3.