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2.3 will not be coming anytime soon, so don't worry about it for now. Once it does, I am sure that either our current root tools will work or some devs will quickly come up with new ones. As far as blocking the update or not updating, I think you can do it for a while. The last update wouldn't install if you has removed any factory apps, this update might be the same.
I am sure the rom developers are working on this, but with the D2's locked bootloader, it makes it harder to do a big update like that.
Your downloaded apps will stay to the best of my knowledge.