Tweak mode lets you quickly move components under the mouse cursor regardless of whether you are currently using the Select Tool, Move Tool, Rotate Tool or Scale Tool.
You can activate Tweak mode by
holding ‘ on the keyboard and simultaneously dragging a component
with 
.
You can now select edge loops by double-clicking a single edge or select face and vertex loops by selecting a face or vertex and double-clicking a face or vertex next to it.
Convert polygon edges to curve
You can now convert a path of polygon edges to a NURBS curve by selecting Modify > Convert > Polygon Edges to Curve.
Normal Average component movement
This option lets you select multiple components or objects and move them all along the average of their combined normals.
UV Texture Editor snapping improvements
You can now use snapping in the UV
Texture Editor to lock your transformations to existing
objects in the scene. You can also access a number of options related
to pixel snapping by selecting Image > Pixel Snap > 
in the UV
Texture Editor.
You can also use Discrete Rotate and Discrete Scale to rotate and scale UVs in specific increments.
A number of new options have been added to the UV Layout Options window, which allow you to adjust multiple UV shells in a single UV space more easily. These options also allow you to offset your UV shells and scale them in the UV space.
Preserve textures during transformation
You can now transform components of a mesh without warping its texture. By turning on the Preserve UVs option in the Tool Settings editor for any of the transformation tools, Maya will automatically perform the appropriate transformations to the UV shell to maintain the overall look of the texture.
You can now bevel within the bounds of a curve by turning on the Bevel inside curves option in the Bevel Plus Options window. Beveling inside a curve gives you more precise control over the overall size of a bevelled surface.
