Roxio CEO Chris Gorog will announce details of his company’s launch strategy for the new Napster in his keynote address at the Jupiter Plug-In Conference Monday. “Napster 2.0,” which will be a legal, paid online music service, will be available to consumers by Christmas, according to a press release issued by Roxio. Users of the service will have access to up to 500,000 tracks “any way they choose — by paying for individual downloads, by monthly subscription, via Internet radio, or in any combination.”