I actually think there is one more cave. You see the aquaduct/railroad line to the very east? Slightly below it are three small isles in the river. Just to the left of the southernmost island, I see something that might be a small cave entrance. I'm not sure if it is a dead end or if other entrances can be seen with enough goodwill (for instance the ledge just above it, or the tiny pond slightly northeast), but I suspect it hides something interesting... Also, the glowing shrub to the southeast simply screams "HERE LIVES XERNEAS!" to me. At the very opposite side of the map (extreme northwest) is some sort of thingy in the forest. It could also be the dwelling of something legendary. EDIT: Just watched that video, and while I agree with them on most of the points, I think they've got the starter town wrong. Judging by the released screenshots, it seems like you'll actually start to the extreme south. All the screenshots apart from those of Lumiose City (and the desert) show the towns and routes directly south of Lumiose. I think the southernmost town will be your starting place, and then you venture north to Lumiose. From there on, it's a "spoked wheel" layout with dead ends, maybe apart from surfing on the rivers. I think Lumiose will be even more centralizing than Nimbasa was in Gen. V, with lots of facilities you'll keep visiting every day.