The compound series has taken legendary forms by now, as everybody recognizes it. However, previously undiscovered Arctic MX-5 thermal paste has been spotted, and it seems a new revision is to be released soon in the form of MX-5.
Arctic itself hasn't announced MX-5 thermal paste, but if you look around for a bit, you'll notice it's already listing at Amazon in some countries. A 4-gram tube sells for roughly 15 EUR/USD. Unfortunately, there are no details available about thermal conductivity or viscosity. The new paste would last eight years after application, similar to MX-4 and MX-2 variants. MX-5 is metal-free and non-electrical conductive.
MX-5 thermal paste will be on sale from March 15th, and that's 10 years after the MX-4 thermal paste release.