On the plus side, it can stream muic through satellite while caching music for playback without connection. I imagine this may cost a little, but if it is as relatively cheap as Last.fm, this should be of no consequence.
What I would really like to know, will the portable player be intuitive to use, does it sound decent (read : as good as my PC's soundcard) when hooked to my amplifier AND can I 'intelligently' connect it to my computer at the same time? Will it have a strong community, does it have smart features as neighbour/recommended radio, can it do fun stuff with playlists by exchanging data formats so developers can make cool widgets and we can hook it to every blog or website in the world (including Last.fm)? Does it do what my favourite webapp for music of all time does?
Is it, in short, competitive?
Then again, why not open your player up for third parties? Otherwise I just don't see the added value except for portability. I would wait for another player to come along and do so.
Any thoughts on that appreciated.