There is a new editor's draft of the CSS3 Grid Layout module available: http://dev.w3.org/csswg/css3-grid-align/
These updates include:
* Section 10: Combined Sections 10.2 and 10.3, so that the overall algorithm is described in a top-down fashion.
* Section 10.2: Removed the function DistributeSpaceToTracksBySpanCount, and added new functions ResolveContentBasedTrackSizingFunctions and ResolveContentBasedTrackSizingFunctionsForItems. The updates to the algorithm change the way in which Grid Items that span multiple tracks resolve their min-content and max-content contributions to those tracks such that "tighter" grids are produced.
We look forward to comments and feedback, and would be happy to discuss these changes further during a future telcon.
Thanks, Grid Spec Editors