Honestly,despite all the criticism,I didn't dislike The Great Gatsby and it was surely a better choice than Grace. The festival's opener is traditionally out of competition,so I hope this will not be the casebut yes,it would be very good to see them there.
I think that Slow West is finished. It was at Cannes in search for buyers, probably there was a private screening or they showed just some footage. I'm very curious to see it too. Let's see what happens with TIFF..
However I've just controlled the IMDb page and the release date for Macbeth is still 2014, 29 January 2015 in Germany.. but I don't know how the news are updated there.
Well, I think The Great Gatsby is a good entertainment and everything but it's an average movie. Its performances are fine so as art direction, photography and costumes but it was too much for Fitzgerald's story. But I agree that it was far a better choice than Grace Of Monaco. Cannes didn't receive Gatsby very well but GOT was much worse based on what I read.
I can see Macbeth opening Cannes but on competition I don't know...Saint Laurent was running up this year so it's a possibility...let's wait and see!

About Slow West, it's probably finished but on wednesday we'll know because TIFF will announce more films! And on the following weeks too. It's definitely a film to be screened over there!