Dual booting probably isn't included the Maemo 5 design specifications. After all, that's what blocks all the other enhancements.

More serious & less snarky:

Realistically, an official, full-featured, Nokia-provided boot manager was a bit much to hope for. Including such a thing in a firmware release would make it Nokia Care supported. That's far fetched, especially since the second OS, the entire point of the boot manager, is a no-no for Nokia Care.

Try drawing those lines for staff in the call center.

A working kexec is probably the best we can hope for, as far as MeeGo dual-boot support goes, in PR1.3. And that's not bad.

The Maemo community has been developing clever and effective multiboot solutions for Internet Tablets and the N900 for years now. For much of that time, while Nokia did nothing specifically prevent multiboot, they did nothing to enable it either. Recently though, multiboot-friendly patches have been making into official Maemo releases, helping the community to build better solutions more easily.

MeeGo is evolving rapidly, and the community multiboot solution should do the same. In the end, that's better than waiting five months for a maybe-PR1.4 to improve an official Nokia boot manager.