Thanks for the help Phill!
It has been pretty busy here indeed and it's great! I've never received so many positive e-mails and phone calls before. Feels a bit like a second New Year's eve :-) We are all excited about tomorrow's release and customers are massively making late orders of Sitefinity 3.7 licenses.
And to answer John's question - anyone that has active 3.x license is eligible for a free upgrade to Sitefinity 4.0. By tomorrow all our current customers with active Sitefinity 3.x licenses will have the official release of Sitefinity 4.0 available for download in their accounts, as well as active Sitefinity 4.0 Standard Edition license keys.
Grisha 'Greg' Karanikolov
Sitefinity Solutions Consultant