We're likely to see across-the-board updates, with the exception of the Surface Go, which launched just a few months ago. Microsoft's Surface Pro is due for a redesign, and it’s likely that the device will take some cues from the smaller Surface Go including a slightly more rounded design and the inclusion of USB-C (or Thunderbolt 3) ports.
When it comes to what powers the next Surface Pro, there's no question that that company will want to use 8th generation Intel Core processors to keep up with the competition. At the entry-level point, a Core m3-7Y30 processor powers the current Surface Pro. However, with the announcement of new Amber Lake-Y processor, it's likely that this will be replaced with an 8th generation Core m3-8100Y.
The Surface Laptop was just introduced last year, so we don't expect any major changes on the design front for this device. However, we're likely to see the Core m3-8100Y for base systems, which will then be augmented by Whisky Lake-U Core i5 and Core i7 processor options for higher-tier models.
What we'd like to see -- although it isn't by any means guaranteed -- is an updated Surface Studio. Microsoft first unveiled this innovative all-in-one desktop machine two years ago and hasn't updated it since. When it launched, it was already rockin' outdated Intel Skylake processors and NVIDIA GeForce GTX 900 Series graphics. It'd be nice if Microsoft could throw some 8th (or 9th) generation Coffee Lake power under the hood along with [at least] GeForce GTX 10 Series GPUs.
So until October rolls around, we'll be keeping an eye out for the inevitable leaks on Microsoft's hardware plans and we'll keep you abreast on any updates.