Check out the patch notes for the v20 Lovely Update here: http://maplestory2.nexon.net/en/news/article/55909/lovely-update-v20
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I highly doubt this will happen. Otherwise, they could have just released RB from day 1 of the headstart.
In any case, it doesn't matter. The solution is fairly simple. On launch, create an alt character to play with and when RB comes out you can delete your 'name' character and remake it.
The problem is that the founder's rewards go to the previously made character, and if there's rewards that aren't tradeable, we can't really delete that character like that... Plus all the progress we did in the mushking pre-event is wasted