Well, from my observation, a lot of people not only left the show but left the franchise in general around the 3rd Gen. So a lot of people didn't even see AG, so it's less talked about than the other saga's.
- I capture all of my pokemon in regular Pokeballs (except for legends)
- I like most of my pokemon to be male unless they look female to me
- I talk to every NPC on my first playthrough of a game
- I always press DOWN and hold RIGHT + B when throwing a Pokeball to capture a pokemon
- I nickname...
As we've seen plenty of times in the past, Ash can still be pretty dumb when it comes to pokemon, no matter how much experience he's gained prior to a new region, so I think Dento will help in that area. I just don't see him and Ash developing a brotherly bond like Ash had with Brock.
I think both Dawn and Brock will appear.
Brock has too much history with Ash to just disappear forever, I'm quite sure we'll see him at some point in BW.
It's not yet confirmed that contest won't appear in BW, but if they don't, I think Dawn will still appear somehow just to get her rightful...