Their wording is quite clear. After July 18th they are recommending that you use the new forms. However, the old ones will still be accepted until Nov 14th 2011, after which applications containing the old forms will be sent back as incomplete.
So anyone sending their applications now can still use the old forms. Although to be honest the new ones are much, much better and with the validation function one can check there are no missing fields etc, so I'd advise people if they are starting now to use the new forms anyway.
Wayne.