The biggest change in this RC is a fix for #613 which is too do a better job of managing the split ratios between terminals as resizing of the window occurs. However, note that this change is fairly significant and also introduces a new attribute for session files. While the new attribute should be backwards compatible, I do recommend backing up any session files you have in case this change needs to be reverted at some point.
Also, a fix for #615 was also introduced, the pointer position is now used to determine the active monitor when positioning the quake window rather then active window as was done previously.