Finally managed to install 2013 on a new laptop today and had a quick play:

1. Have the icons changed? Seem a bit different (better/sharper).

2. Conic curve sketch tool - very nice. Couple of things though. Firstly can this be added to the spline group of sketch tools by default. In this beta it has to be added via customisation - you are missing a trick there. The end constraints are restricted to tangent and point only. No curvature? I grant you with this tool tangency is probably all you need but is there a technical reason why no curvature?

3. Extrude multiple thin features from multiple open profiles - excellent.

4. Appearances copy and paste - at last