According to this post in the CoreCodec Forums the highly anticipated CorePlayer Mobile for Symbian OS will be launched next Wednesday. CorePlayer is a multimedia player that supports a large number of formats including WMA, OGG, FLAC, DivX and XviD. The player will be available for S60 2nd Edition, S60 3rd Edition, UIQ 2 and UIQ 3 devices. Read on.

CorePlayer Mobile is already available for the Windows Mobile and Palm software platforms, the Symbian version will have the same features as these existing version.

The formats supported in the existing version include (from the CorePlayer website):

Audio: MP3, AAC, MKA, WMA, WAV, OGG, Speex, WAVPACK, FLAC, AMR, ADPCM, ALaw, MuLaw, and Midi
Video: H.264 (AVC), MKV, MPEG-1, MPEG-4 part 2 (ASP), DivX, XviD, WMV+, MJPEG 

Below is a YouTube Video demonstrating Core Player running on a Nokia N80.