I'm going to explain this idea with pictures:
I'm listening to R.E.M.'s Automatic For The People album. I'm on track 1 (Drive) and I'm in this view:
I want to know what the next song is without interrupting the song I'm currently listening to, so I begin to scrub to the left:
At this point this view would be far more useful if it also showed, at least, the name of the next track somewhere. At the moment it tell me nothing other than the next song is from Automatic For The People - which we already know.
At the moment, the ability to partially scrub without "committing" to the next song is only useful is you have a playlist with songs from a mixture of albums.
This idea has been submitted more than 1 year ago but unfortunately hasn't gained enough kudos during that time (10 kudos/year). In order to keep an overview of the active ideas in this forum, this idea will be closed for now. Note that this does not mean the idea has been declined by Spotify.
Please feel free to re-post this idea if you still feel you want this implemented. With a little change in presentation, maybe this time it will gain the necessary support from the community.