Entro is the only person I really know so go Entro! B2B NDGS Champ!
Don't really follow other NDOT so just from an Ubers perspective:
1. Entro - Not really a surprise as Entro is one of the best Ubers players on smogon and the NDUbers TL. If Entro takes it seriously and brings a good team it is going to be really hard to beat him outside of a massive builder advantage or some luck. I doubt he is bringing Mega Medicham to playoffs.
2. Emoxu9 - Won the Ubers Slam and played very well throughout. They're a very good player in general and they either build decently well or at least select teams that are well built and is a great player who is unlikely to make mistakes. I'm not going to go back and look at the 350 turn g2, but I don't recall any major mistakes. In hindsight I'm a bit salty I decided fuck it I'm tired as shit and don't care, let me load a fun team and Band Ray + Specs Lunala wasn't loaded into the stall team.
3. Seraphz - Seraphz is pretty good skillwise, but some of the teams she loaded in the NDUbers Open left me a little skeptical. The Skymin did go 4-0, including v me, but it did have a lot of luck in the early rounds. The Arceus-Ghost team was very cool, but it does make me wonder if it would be better to go with 'safer' stuff that doesn't require as precise play. Emoxu9 is a good player who has brought generally solid teams that will be hard to catch off guard. That being said, I do think Seraphz can win if she puts the time/effort.
4. Everyone else but Seth. The only memeory I have of anyone else playing NDUbers is wondering why Sealoo didn't use Wild Charge on Runo's Pogre in R1. Don't really know the other five players at all or well enough to make any predictions. I also don't really follow other ND tiers beyond skimming the forums and looking forward to towards one of the really great NDUU/NDRU discussion posts whenever those drop.
Edit
8. Seth - Seth proposed dropping NDUbers from NDPL.