We don't yet know what functionality that it will have, only that it will include the ability to resume and note that the comment was "to a certain extent make a download manager redundant for me" the emphasis being for me.
I personally don't need much of a download manager, the ability to resume being the most important. Whilst I currently can't configure the firefox download it is just as quick as start downloader which has many configurations.
I only have it set for three simultaneous downloads, the problem is on dial-up you can have as many downloads as you like it still 'all' has to squeeze through a very narrow bandwidth it all can't get through at once it has to queue up, so for me a download manager has a limited effect.
