Given your modeling skills, I am surprised you are not a beta tester. But a better knife tool is not key evidence of a new core in action. New core as described by MAXON points to so many other capabilities than smarter modeling algorithms....unless I am reading into "massive data parallelism" too much.
For me, apart from the hope of what a true new core would be giving you (like fluid simulation with OpenVDB support), I would love to see the following with the existing tool set:
Emissive materials --- please!!! Very desperate for this and would change the render quality/capability in a huge way.
A proper symmetry tool...select an polygon, click a button....you get symmetry about that polygon regardless of where the object is located within the scene file. Now imagine if you were to animate that capability....pretty interesting motion graphics opportunities.
A spot light or tube light that allows you to independently change the size of the opening at each end. I hate using volumetric spot lights that start from a razor sharp point.
The ability for lights (especially volumetric lights) to pass through polygons shaded with transparency or alpha maps.
An upgrade to the sky tool to include spectral atmospheric effects. Sorry...the existing sky tools are painfully outdated given what you accomplish with other programs like Terragen and/or Vue.
As well as what everyone else wants (Bodypaint, viewport, etc).
Dave