Star Trek Online lead systems designer Phil Zeleski has penned a new dev blog concerning fleet veteran heavy destroyers. These tier six vessels will be added to the game in an upcoming update and may be obtained by players who are 1000-day veteran subscribers or lifetime subscribers. They cost 20,000 fleet credits and one fleet module.
They gain 10 percent hull hit points, shield hit point bonuses, and an additional console slot over their regular tier six counterparts. The dev blog linked below has the full stats.
Source: Dev blog