That's exactly what I thought when I saw it, too.
oh... and... 52 portals...
bwah-ha-ha-ha
I thought of that and was thinking that we can see things from other Earths as well - Earth 3, 4, 5, whatever.
Unless its something boring like all 52 portals lead to Earth 2.
Also the train we saw at the start of that scene is the kind of vintage, yet futuristic looking technology they used to have in those 40's books as well.
Of course we don't know anything about this version of Wells - he could be a bad guy for all we know.
I just hope this is a season long thing and not wrapped up in like 4 episodes. There is SO much they could do with this multiverse arc.
Heck they could even promote the new Flash film by making that one of the alternate Earth's.