I posted a link to sketches of the sedan a while ago,
http://9thgencorolla.com/forums/viewtopic.php?t=7431
But apparently after seeing the new Euro Civic hatch, Toyota has had a rethink on the styling.
I think to get an idea of what it will look like, you need to look at the new Camry and Yaris as it should carry the same sort of styling theme, solid, chunky with slightly flared wheel arches. I think it should be good.
Here's some more pics from the article above, very nice!