I keep pretty up to date with tech news and I keep searching t'interweb cool stuff.

Most drone weapons are just a bomb strapped to a glorified quad-copter or a small unmanned aircraft. Quads are terrible at firing guns as the recoil completely messes up their aim. The unmanned aircraft type have a far more varied range of weapons that can be fitted but they have many of the drawbacks of their manned counterparts, most notably the need for a substantial runway.
Power armour has three main problems to overcome before the technology becomes viable in combat.
Power : Even with the best battery technology we have the power/weight ratio limits operation to less than a day, far less than what would be required for full battlefield operation.
Heat : All of the motors, servos, batteries and pilots generate heat. Wrapping all of those in enough armour to stop a bullet tends to cook the occupant.
Haptic feedback : Even with sufficient training there's enough delay between moving a leg and the power-assist registering the movement that using power armour can be surprisingly tiring. The VR motion-sickness problem would be a reasonable analogy.