If you want a timeline, look here:
http://story.news.yahoo.com/news?tmpl=story&u=/nm/20030111/tc_nm/tech_sonicblue_dc_1

1) In March, release software to improve networking between units and activate the USB port.

2) By the end of the second quarter, MP3 playback and storage capability for ReplayTV units.

3) During the third quarter, a new under $100 receiver to allow playback only of material stored on ReplayTV boxes.