Kentico have estimated their next release for Q2/2010 which is just around the corner. A few new features have come in that should certain challenge any enterprise level CMS competition.
More and more clients are after better marketing data about their consumers so they can better target them. On-line Marketing Package seems on track to begin to fill this void. It will be interesting to review the final release to see if this will be a market competitor. Amount other features are Azure support, On-site editing and Bidirectional staging. They haven't spelt out what these would entail, but it certainly looks promising.
Check out their roadmap for version 6: Kentico 6 Roadmap