Thanks for posting! Spotify is always testing features, so that may be why the queue button has been replaced with the share button your device. If you'll just tap the three dot menu at the top right in the now playing screen, you'll see the full menu for the current track, and I believe you'll still be able to get to the queue from there by tapping "go to queue" at the top.
Here's a screenshot of what it looks like on my Android phone:
Let us know if it's missing from there too, but hopefully that will get you back to your queue!
dinomightRock Star 10
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I do not have a "go to queue" from the three dots menu in "now playing" either, only add to queue. There seems to be literally no way on the android app to view or edit the queue after you decided to test this feature. Correct me if I'm wrong but this seems incredibly sloppy. I don't see why not to have full easy control over queue including clearing the whole queue at once from mobile like one can do from desktop.