Lightroom 5 beta video 2 – Develop Module: Lens Correction
New information under the histogram: Original photo + smart preview. Process version.
Lens Correction -> Manual has a new slider, Aspect (stretch/constrain the aspect horizontally or vertically)
Lens Correction has a new tab, Basic. You can turn Profile Correction and Chromatic Aberration on/off from here. Also you control the Upright (perspective correction).
Upright: Automatic perspective correction has four different options.