If this was the Sinnoh League, I would be more excited, as Ash would definetly win.
This time? I don't think so. His team is so undertrained, and only has one fully evolved Pokémon, Unfezant (compared to Sinnoh's 4), so chances are, an undeserved win will come to someone.
Besides, it doesn't matter what Pokémon Ash would use. The writers could've given Ash his old Pokémon back if they wanted to, but that would still not change the fact that he'd still lose if they wanted him to, the Pokémon he carries have nothing to do with it. His Pokémon aren't undertrained, it's just something that the fans have come up with after comparing Ash's Pokémon now to those he had back in Sinnoh. And the writers would surely not agree with that either.
''A single thread in a tapestry though its color brightly shine, can never see its purpose, in the pattern of the grand design.''
If you look at his current rivals, his team isn't that poorly equipped to go against them. I also think Ash is bound to get 2-3 more evo's before the league, and I can even see them pulling mid-battle evo's as the league is actually going on as that's what BW has been doing.
Serperior is shown to be the biggest threat in the league, but obviously Ash will find a way to beat it this time as he's not going to lose to Trip in the league.
About the league, I really think Ash will win for some reason.
About the rival face-ups, I think this is going to happen.
Ash VS. Trip - Ash wins, Trip will lose, but decides to stay and watch and learn from other trainers.
Bianca VS. Stephan - Bianca will win.
Ash VS. Bianca - Ash will win.
Ash VS. Virgil - Ash will win.
Ash VS. Kotetsu - Ash will win.
I think Ash will also face a fierce powerfull trainer like Tobias in the last round, however, without the powerhouse thing.
If any rivals battle each other it'll probably be Trip Vs. Bianca, because she beat him before and Trip had a rematch against Cilan to win over him.
I can't see Trip being an early match at all.
Well if they do have rivals battle each other we better not see there entire team get sweeped like what happened Barry when he battled Paul which made his entire character feel slightly pointless.
What i think is going to happen is that most likely we will get a Tobias-like Rival who will be shown to trounce the competition with or without legends and he/she will be the one to knock Ash out of the competition only to for him/her to win it all. I can't really see Eevee dude or Kotetsu or even Trip beating Ash. I believe Ash may make it to the top 4 and lose and it's not a question of "does he deserve to make it that far or not?" because the Unova League may end up hosting a weaker level of competition that past Leagues. Just by looking at all the rivals, Eevee-dude and possibly Kotetsu non-withstanding, they all suck in battling ability compared to Gary,Morrison,Harrison,Tyson,Barry, and Paul, all of his rivals at the past leagues Ash previously squared off against. So Ash being weaker may not even factor much into his performance nor should we come to expect such. If Eevee guy and Kotetsu face Ash before Trip, then expect the writers to introduce a uber strong trainer ala Tobias whose sole purpose is to knock Ash out of the tournament and win. That is what i am most expecting. Especially considering Harrison,Tyson,Ritchie,and Tobias were either introuced at the start of the league or during the league. Both Kotetsu and Eevee-dude were introduced in standalone episodes as far as we know.