snap info is in theory what you want. However, it's up to the developer to tell the store what version they've uploaded. The vlc developers haven't done this:-
alan@gort:~$ snap info vlc
summary: "The ultimate media player"
VLC is the VideoLAN project's media player. It plays MPEG, MPEG-2, MPEG-4,
DivX, MOV, WMV, QuickTime, WebM, FLAC, MP3, Ogg/Vorbis files, DVDs, VCDs,
podcasts, and multimedia streams from various network sources.
stable: daily (4) 120MB -
candidate: daily (4) 120MB -
beta: daily (4) 120MB -
edge: daily (4) 120MB -
However with other snaps the developer has, e.g:-
alan@gort:~$ snap info atom
summary: "A hackable text editor for the 21st Century."
Atom is a free and open source text editor that is modern,
approachable, and hackable to the core.
installed: 1.16.0 (2) 150MB classic
refreshed: 2017-04-21 16:35:56 +0100 BST
stable: 1.16.0 (2) 150MB classic
candidate: 1.16.0 (2) 150MB classic
beta: 1.16.0 (2) 150MB classic
edge: 1.16.0 (2) 150MB classic
I would consider this a bug in the upstream package and the developer should resolve it.