Source: VK Wotleaks community
in 0.9.3, M5 Stuart will be reworked to HD. It will also be changed – it will lose the 75mm howitzer and the open top turret (unhistorical combo), instead, it will have a 37mm autoloaded gun, called T16.
Characteristics on supertest (with the 37mm autoloaded gun, elite configuration):
Penetration: 56/78/19 (same as the 37mm M6)
Shells in clip: 5
Reload time between shells in clip: 0,674s
Reload time of magazine: 7,384s
Engine power: 350hp
Hull traverse: 42
Terrain resistance: 0,863/0,959/1,822
Weight: 15,246 tons
Summary: these data are preliminary, but it looks like quite a maneuverability nerf (vehicle got heavier, traverse reduced, worse passability), the top gun is practically equal to the pre-top, just with an autoloader and cca 10 percent more DPM.