I'm not happy to release this so soon after 1.0.0, but I found a high-severity media query regression introduced by 1.0.0-rc6 a couple weeks ago. With tests split across two media list implementations (the old one kept for compatibility and the new one) the bug was not immediately detected.
A bunch of other (lower impact) fixes from the master (2.0) branch are included too. Users of RC6 or the final 1.0.0 should upgrade.