That is an easy question to answer ...
If you are selling your 280, then what graphics card will you be using in the meantime?
If nothing, then will you be happy to go without a computer for a few months (assuming that there are no delays and that it is affordable when released).
If you have another graphics card, then will you be happy with this other card for the time being (probably at least 4-6 months)? If so, wait.
