I think that
against MAS, CHN is still assured of MS 2/3 and one doubles match (presumably Hoon/Tan at MD1 with Lim/Goh at MD2)
against KOR, I don't see how they can't win all three singles matches. Plus Kim/Kim has been pretty off recently, two first-round exits in the last two SS tournaments.
I think CHN should be most worried about INA. Both Ahsan/Setiawan and current INA #2 Saputra/Pratama are in pretty good shape. From Tommy, SDK, and Dionysus taking a match off CHN MS is not unthinkable.
For DEN, they don't have a good MD2 or MS2, MS3. CHN probably shouldn't be that concerned about DEN.
As for JPN their MD1 is I think a tossup with Liu/Qiu but MD2 doesn't match up too well.
All things considered I think the biggest threats to CHN are INA>KOR. KOR doesn't really have the singles to punch through CHN, I think, even though SWH is not weak. INA and CHN I think are about 50-50 to win Thomas Cup this year.
However, not much discussion to be had about Uber Cup.