This idea has been merged into another idea. To comment or vote on this idea, please visit DOMINO-I-1408 Integrate Project Keep into the next release of Domino.
During recent presentations (e.g. digitalweek and dnug47online) I have seen "Quattro" as integration for multiple types of clients (e.g. Apple Mail and Outlook all versions ?!) and related protocols to exchange PIM data with Domino. This is so far labs/research state, part of the "Keep" approach, which has the same status. So far there is neither a date for a release into the product nor it is mentioned on your roadmaps (e.g. for release 12 or 13 of Domino). Please take care to materialize this one as soon as possible, since this way of seamless integration of Domino based information without the need for services like Traveler and other conversions of calendar content makes life easier for all involved people (users, developers, admins, ...).