Upgrade my S7 to Pixel 2 now or wait until Pixel 3 comes out?

[lazypapichulo21]

I'm looking to upgrade my girlfriend's Samsung Galaxy S7 and I thought hooking her up with the Google Pixel 2 would be a great option! However, would it be worth it to wait until the Pixel 3 comes out and then upgrade? Or should I be ok with upgrading her phone now?