According to documents filed with the FCC, Google's follow-up to the Pixel will feature a squeeze function. Tentatively called "Active Edge," the squeeze functionality sounds like it imitates a feature introduced by the HTC U11.
This news isn't very surprising, considering HTC's involvement with the design and development of the next Google Pixel. In fact, it was HTC itself that filed these test reports with the FCC in the first place.
The document confirming the addition of Active Edge illustrates that the squeeze functionality can be used to activate Google Assistant, though it's very possible you'll be able to customize Active Edge so that it does something besides activating the assistant.
It also remains to be seen if Active Edge will be making its way to forthcoming Pixel XL successor. While it's puzzling to imagine a bigger, more premium version of a smartphone not having all of the features of its more modest counterpart, rumor has it that LG—not HTC—is spearheading the design of the extra-large Pixel this year. It's certainly likely that HTC's squeeze function will stay with the HTC-designed Pixel.
Unfortunately, we'll have to wait a bit longer to see what the future of the Pixel has in store for us. We expect an official announcement this fall.