Hi Dr. Zoiberg,
I can only provide a "marketing like" answer "It is on our list".
But when and how it will come I can not yet say.
This is good news. Last year while I was using Live 4 I was given the same answer when I asked about Plugin Delay Compensation. Now that Laptops may support dual core I would suspect Live 6 (hopefully!) will support multi-CPU. Since so many users of Live use laptops today and only 14 months ago Midi was implimented, it never really was a priority for multi-CPU support to exist until now.
There were some Pro Tools LE users at the Digi DUC who ran tests on single P4 vs. Dual Core, even though Pro Tools is single threaded like Live, and Pro Tools still had better CPU performance on the dual core. This was P4/3.6Ghz vs. 3.2Ghz dual core. I don't know the details of the variables unfortunately.