LG and others already offer networked Blu-ray players like the LG BD 370. Sony announced in September their networked Blu-ray player model dubbed Sony BDP-N460.
The Sony BDP-N460 is available for pre-order on Amazon.com for $249.99 and is supposed to ship this month.

The internet service of the BDP-N460 supports YouTube, Slacker, also Netflix.
The BDP-N460 also features built-in software specially designed for use with the Linksys by Cisco Wireless-N Ethernet Bridge with Dual-Band (WET610N, sold separately). The bridge helps ease the connection between the Ethernet–enabled player and a wireless router in either the 2.4GHz or 5GHz radio band for optimal streaming.

Since many consumers own extensive DVD movie libraries, the BDP-N460 incorporates Sony’s Precision Cinema HD Upscale technology that converts standard-definition signals (480i) to near HD quality.
The BDP-N460 can decode the latest advanced audio codecs including 7.1 channel Dolby TrueHD and Dolby Digital Plus, DTS-HD High Resolution Audio, DTS-HD Master Audio. The model can also output 7.1 channel L-PCM via HDMI after decoding.
More details on Amazon.com.