Project Treble is the most important thing in this release >The biggest change to the foundations of Android to date: a modular architecture that makes it easier and faster for hardware makers to deliver Android updates. With any luck, this will end the huge security/update problem Android has. Right now an update is dependent on the chip manufacturer's drivers, then the OEM adding them to the ROM with their custom "…
As I commented in another HN story, I don't believe OEMs and telecom operators will release updates, if Google doesn't force them to do so. They already admitted on the ADB Podcast that they don't want to remove the ability for OEMs and mobile operators to customize their forks of Android. We will still be forced to buy new devices even if they are VTS certified.
I doubt we'll see much change. I hope it'll make it slightly faster but without an agreement with OEMs that has teeth forcing them to be more expedient I can't see this getting much better.