Caching headers, style's separating imports, comment exclusions from minification, and quality improvements. See below. And you can always see full change log of Accelerator for WordPress.
Last changes
New features
- Caching particular headers.
- Style's separating imports.
Improvements
- Data that marked with [et-ajax] in comments is excluded from minimization.
- HTML minification: Exclusions for comments.
Fixes
- Ajax requests could be blocked by another plugins.
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More information can be discovered in the original post about New version 2.6 released - Accelerator for WordPress and on the main site.