I'd be really surprised if Dell refreshes the U3014 with a new 16:10 2560x1600 model. I imagine it is incredibly hard to sell a $1k+ monitor these days that isn't 4K.
If anything, they will refresh the UP3214Q with a new model.
I wouldn't mind a 34" wide if it were say 16-20" tall. Samsung has a 32" panel that has the right dimensions but it isn't curved. I wish they'd curve it for folks like me.