If they have not changed their policy, Tesla only allowed 60's to enable DC fast charging; 40 owners would have to upgrade to 60 first.
IIRC, they want $12,000 to enable the 60; which was a $10,000 option during the original order process. The $2,000 upgrade penalty was no doubt intended as an incentive to purchase the 60.
There used to be two upgrade options for fast charging. Again IIRC, they charge $2,500 to enable supercharging, but for $1,000 or $1,500 you could enable DC fast charging for access to CHAdeMO, for example.
So for a 40 owner, you could spend $13,500 to enable CHAdeMo, or $14,500 to enable SC. Plus sales tax if applicable.
Edit: Yes, that would be quite a gift if Tesla is now waiving fees to enable DC fast charging. I seem to remember there may have been some hardware that was omitted from early non-SC enabled cars though.