Can confirm that there is no major Best Picture campaign for Wonka. WB will only be pushing Wonka for below the line categories (costumes, production design, song, etc).
More important for the studio than its Oscar chances, Dune Part 2 was moved off its release date because WB sees this as their potential next big cash cow franchise. Villeneuve has recently revealed his desire to make a third Dune film, adapting the "Dune Messiah" novel. He will also be producing the planned Children of Dune series for Max. So, Dune Part 2 has to be financially successful in order to generate interest and justify a new franchise. WB has decided (rightfully) that they need the star power of their A List cast to drum up the needed ticket sales.
Barbie and The Color Purple will be WB's major Best Picture pushes this year. It wouldn't make sense to move Color Purple's release because movie musicals already have a set audience size (usually) and its financial well being will not depend on Imax and/or 3D screenings like other tentpole films. Plus, this is one of the few genres of films that could increase its box office based on Oscar noms/wins, so awards season is the best release window. It's a shame the stars wont be able to promote it, but a smart marketing team will be able to craft a decent campaign for it based on the beloved nature of the material alone.
The special look is great. Really hoping this one delivers!