1) it means nothing. the estimated queue time is probably calculated based on the number of players that are queueing at that time, butit doesnt prevent you from waiting much longer than the estimation.
2) next to your name and civ in the left half of the screen theres a yellow “?”-mark (to enable random civ) and another question mark for your position/colour. click it to change colour.
3) yes it means you won, and your elo did change. it just doesnt show the usual post game screen, but it should count as a regular win.