Re: "Current phones are not compatible with "Apollo""
No its not enough, its called FUD when you make something up like that, which is what you have done unless you can back up what you said.
WP wasnt restricted to a single core, it was just never designed to use it, there for why would OEMs put one it in?
Apollo, doesnt requirer a dual core, the update is designed to make the OS support dual core, enabling OEMs to make dual core devices if they wanted too combined with the Tango update which is designed to make WP run on slower devices, ie to make a budget phone enables WP to support a much larger device base than it currently does.
MS has stated openly that the first release was to get out there, after that they would build and improve appon it. The UI is already setup to take full priority over anything else, this is why it is quicker in most cases than many "other" smartphones.
and finally It multi tasks just fine if the developers choose to enable it, i have a sat nav program that when switched to another task, say a web browser or sms messages then go back to the sat nav program, its placed me exactly where i should be rather than having to work it out again, so it does do it.