There is a new version of the UCA on http://www.unicode.org/reports/tr10/
The most significant changes are: - Additional collation weights for newer characters - Weight fixes for well-formedness and consistency - An additional conformance clause - Additional well-formedness constraints - Removal of completely ignorable characters - Treatment of ignorables after variables - Modified and reorganized implicit weight derivation. (In particular, CJK characters and unassigned characters are given different weights.) - Use of the Logical_Order_Exception property - Notes on notes on linguistic applicability. - More discussion of stability
