Re: Sony Announces Release of Initial BD-Live Profile 2.0 Software Titles
Think of the Matrix trilogy with its animatrix extras. The DVD for the first movie has a link to the website that has the animatrix videos as they are produced after the DVD was shipped. Also updates to upcoming sequals. Extra content. Alternate dialog, reviews, interviews etc that are produced after shipping.
It could make the movie more current or leave niche extras off disk to allow more space for needed content.
Just more options, not necessities.
I have a few DVDs that do this when played on my computer.