Aside from the price break, the BD570 hasn't changed much from the BD390. Yes, the BD570 doesn't have 7.1 analog-audio outputs, but there's still NetCast streaming services (including Netflix, Vudu, YouTube, Pandora, and Picasa), built-in Wi-Fi, onboard storage, and it has an excellent image quality. What has changed is that the competition has caught up; nearly every manufacturer is offering a Blu-ray player with Wi-Fi, Netflix, and onboard storage at this price in 2010.
There's also 3D Blu-ray looming on the horizon and the BD570 isn't compatible; Sony is promising a firmware upgrade this summer for its competing BDP-S570. Don't get us wrong--the BD570 is a still great Blu-ray player, but it's not the standout product that last year's BD390 was.