Ugh! That disgusting Baron with all those warts on his face next to his doctor admiring him was pathetic! Hope we never get to see the Baron looking like that, again! And please, no more heart plugs, milking cats and his spitting on Jessica - for crying out loud Lynch, WHY?! 
Now has anybody checked out Mark Molnar's Project Dune artwork? Hope Denis Villeneuve has taken notice... 
http://markmolnar.com/project-dune/
And lastly, while reading through the book this has been my cast that I've envisioned thus far. 
Paul Atreides - Tom Holland / David Mazous (find me somebody better if there is anybody more suited) 
Duke Leto Atreides - Benicio Del Toro 
Thufir Hawat - Jeremy Irons 
Dr. Wellington Yueh - Gary Oldman 
Gurney Halleck - Graham McTavish
Duncan Idaho - Clive Owen 
Lady Jessica Atreides - Catherine Zeta-Jones 
Reverend Mother - Helen Mirren 
Baron Vladimir Harkonnen - Vincent D'Onofrio 
Feyd-Rautha - Jack Gleeson (suggest me otherwise) 
Glossu 'Beast' Rabban - No idea
Piter DeVries - Lee Pace 
Emperor Padishah Shaddam IV - Edward James Olmos 
Princess Irulan - Emma Watson (for the meantime) 
Liet Kynes - Liam Neeson / Mads Mikkelsen / Mikael Persbrandt
Stilgar - Alexander Siddig / Shaun Toub
Chani - No idea.