This has a host of new features added to the already excellent 770QE. Some have been brought across from the 790 Plus but others are completely new: 
7" Colour touch screen
BSR 3 Mode - New feature
Kick Start - New feature
Presser foot selection in sewing mode
Triple stitch
Pinpoint Placement 
Scaling Lock for Pinpoint Placement - New feature
Group/ungroup layers and designs
Rearrange layers and designs
Wordart
217 Extra Decorative stitches
3 Extra sewing alphabets
2 Extra Embroidery alphabets
135 Extra Embroidery Designs