Laura Osnes would be quite charming. The role is interesting in that it's definitely not a big belty role, but not some big rangey soprano either.
Definitely curious as to how they'll go with the Trunchbull. From the video footage I've seen it does appear to be a fairly physically demanding role so I'm guessing they'll stick with a younger actor/actress (Bertie Carvel is only in his mid 30s, if I recall correctly) and allow the costuming and wigs and make-up to keep that feeling of age and physical grotesqueness.
If Bertie Carvel and Lauren Ward don't transfer, I could see Raul Esparza as Trunchbull (in the event of LoF not being a runner), with maybe Jennifer Laura Thompson as Miss Honey. Would like to see Leslie Kritzer and Will Swenson as Matilda's ghastly parents. Great news that this is coming...it's a corker!
Honest question, is he tall enough? The casting breakdown does pretty specifically state that they are looking at men 6' and taller, which makes sense considering how physically imposing the character needs to be.
Oh, and Leslie Kritzer would be a hoot as Matilda's mother.
And for a lesser-known choice for Miss Honey, Julie Foldesi, who was a standby for Sutton in Little Women as well as ensemble for South Pacific and soon to be in Newsies would be a great choice.