Modeling

Selection

Select non-manifold now has options to select specific types: Wire Edges, Boundary Edges, MultiFace-Edges (3+ faces), NonContiguous-Edges (flipped faces). 00cb9e5f1cfab14.

Face split by edges: a tool to split selected faces by loose wire edges. dd9a33dc83f912c.
Dissolve vertex now has option to tear boundaries rather than merging faces 1f55044617d167e.
Bevel now has option to set the material of the newly created faces to the material in a given slot. Leaving the material index at -1 (default) keeps the current behavior, where the material is inherited from the nearest face. 70453c578dcdce5.
Extend Vertex (Alt+D): Helps to easily add details to existing edges. Similar to the rip tool it depends on cursor location to choose the edge to extend along. 5861e528d649063.

Edit-mode intersection tool

A new Intersection Tool was added to quickly cut up geometry. It's a bit like Boolean Tool, but, does not calculate interior/exterior.

Access from: Mesh -> Face -> Intersect.

The Array Modifier got a 10-100x performance enhancement. (D443 commmitted in ab06ec7)
The Bevel Modifier has the same new option for setting material as the bevel tool (see above).