From a video standpoint, it's all pretty standard.  It outputs Blu-rays at 1080p/24 and DVDs get the 1080p treatment as well.  It handles x.v. Color and Deep Color too, but doesn't do anything as far as 3D is concerned.

It's fairly capable when it comes to audio.  It handles all the current HD audio formats, and it can direct bitstream and output multi-channel Linear PCM through HDMI.  It's got digital coaxial and optical digital outs, but if you're looking for analog outs, you'll have to deal with a down-mixed two channel output.

The BD-S667 is DLNA capable, and can play back some WMV files, though that's about it for video.  It can display JPEGs while simultaneously playing MP3s, which could be nice.  It also handles Netflix streaming, which has quickly become a standard feature for Blu-ray players.
Yamaha hasn't announced a release date for the BD-S667 yet, but it's available for pre-order now at $329.