Once you get your Pixel on the Q beta, you'll find an app in your drawer called Feedback.
If you prefer, you can download the latest Android Q Beta build and manually flash it to your Pixel device. You can still prevent an app from accessing your location, or give it permanent access, but now there's a middle ground of only letting an app access your location while it's running - iOS offers a similar feature.
Other features of Android Q include new codecs such as AV1, Opus encoding and HDR10+ on supported devices, revamped Sharing Shortcuts, improved ART runtime and Dynamic Depth open source format that allow third-party apps to apply specialized burs and bokeh options. The handsets supported are Pixel, Pixel XL, Pixel 2, Pixel 2 XL, Pixel 3, Pixel 3 XL along with the official Android emulator. In the upcoming Android Q, such another change will be coming and, this time, the ax will fall on apps read and manage items you copy to Android's clipboard.
Also, the access to sensitive information such as IMEI number and serial number will be restricted on Android Q. The Wi-Fi stack in the new OS comes has been rebuilt to deliver enhanced privacy and performance.
In other permission related changes, the Access Storage permission has now been split to individual folders that includes Photos, Videos, Audio and Downloads. We have a dedicated article on how to enable dark mode in Android Q that you can check out. Windows phone users may remember that from the before-times, but now Google is bringing it to default Android.
Google is further improving its permissions model with Android Q to make it more privacy-friendly.
The more traditional way to get the Android Q developer preview is to go the system image/manual flashing route. Bugs in the beta can cause you to have to reset the device. And when connected to an external monitor, you will be able to use the new desktop mode with your Android phone.
The beta is aimed at developers rather than normal users, but that doesn't mean you can't install it and have a poke around anyway.