Arctic (formerly known as Arctic Cooling) has been pushing out cooling products for 20 years, but has not released a new thermal compound since late 2010. That is about to change. Over on Amazon's UK portal, there is a retail listing for a brand new MX-5 paste.
Unfortunately the listing is short on details—there is no mention of viscosity or the paste's thermal properties. However, it does share some traits with its popular predecessor, the MX-4, those being that it does not contain any metal and is not electrically conductive...