Blizzard clarified a few points in their rogue changes forum thread. Some mechanics were unclear, and Ghostcrawler chimes in near the end to talk a little about PvP balance.
To clarify on Combat Readiness: when activated being hit will build up the Combat Insight buff. If not struck within 6 seconds of the last hit it will fall off and the Combat Readiness state will end. If the rogue continues to be hit however Combat Insight will continue to reapply, and it can be applied up to a maximum of 30 seconds total..
Recuperate is long overdue, and will be interesting to see how much it actually heals for.
Numbers aren't quite hammered out yet but it restores based on max health and the more combo points used the longer it lasts. While it's introduced as a low level ability it obviously scales with gear and base health upgrades (being based on max health and all) and be useful for more than just leveling.