I know Hugh has been hard at work on updating the VDL Templates for Sibelius 7, so expect some news from him over at [url=http://www.thewritescore.com]The Write Score[/url] sometime soon.
Generally, you should be okay running Kontakt 4 [url=http://www.native-instruments.com/#/en/products/producer/kontakt-player/?page=781](or the free K4 player)[/url] within Sibelius 7 given you're in 32-bit mode. If you'd rather not fumble with technicalities in the new stages of these releases, you may want to wait a bit before taking the plunge. At least that's what I'm doing with my own rig! More updates will become available in the coming months, I'm sure.
Legacy Forum Post
about 10 years ago
I'm planning on installing a new HD in my MBP, so before I do that, I'll install Sibelius 7 (after it arrives in August) on my current drive and see how it fares and give everyone a heads up. Between Lion, Sib 7 and K4, I should have an idea of how well they might play together.