This is one of the things about rumors.... It could be any time.
However, Pre-Sale means just what it says - before the availability of the product.
From a company standpoint it would not be good to stop a promotional offer of "Pre-sale" before the product is released. This would tick off customers who still "Pre-purchase" but are cut out of the promotion even though they are "Pre-purchasers"
I don't *think* CW would do that...
Those involved in the presale should probably be cheking their inboxes thursday for the DL of Sonar X2... since they get it a day earlier than everyone else.