NA has a lot of new look teams who have recently switched out at least one player. Here are a few that I think look good enough to make a run in Challengers 2.
EG: They have recently added c0m who is a good, if unexperienced, IGL. I think with Potter's guidance this team can be really good.
100T/TSM: The new look 100T and TSM teams both look good, they are pretty well structured, and I think that they will continue to improve quite a bit.
Akrew: After losing Kanpeki, Akrew have continued to look good and I think that they are still improving: dangerous team that people need to watch out for.
NRG: This is the team I'm least certain about despite the perfect run. I feel like s0m is still a little inconsistent and while they have proved they don't need him to win, they might struggle when getting duelist diffed. However, Ethan has slotted in very well and this team can definitely make it far assuming they keep form and continue to work on strats.
Notable teams I didn't mention:
Faze- This team has a lot of fragging power but I wasn't impressed by their strats, I think they will be exploited by better teams and wont do too well without BabyBay going crazy. Also, dont like Supaman too much on this team but I need to watch more of them to see if his impact is less obvious.
NYFU- They are close to making the list but I feel like they need to work on their comps and strats a bit more.
Ghost- This team gets a ton of hype but I don't see it. They seem inconsistent and their play seems kinda readable, especially given how many vods teams have access to.