Today sees the release of the hotly anticipated Elite Dangerous 2.4 Beta. For those of you who don't know, Elite Dangerous 2.4 'The Return' is mostly concerning the reappearance of those dreaded insectoid extraterrestrials, The Thargoids.
While the Thargoids are the headline act of this update, I would not expect to see much of them in this beta. Considering past leaks from Commanders who managed to get to where they should not have, I'd expect Frontier to keep these cards hidden firmly up their sleeves.

The 'Holo-Me' system, introduced in the last patch, will see the introduction of eye wear and twelve new hairstyles. Now us bespectacled folk can more accurately mold our commanders into our likeness. You could speculate that the eye wear could have future functionality, possibly used for an augmented reality HUD for when we take our commanders for a walk without our helmets on. If you ever wished the sleeves of one suit and the legs of another were with the torso of the one you were wearing, well now your wish can come true. You will be able to mix and match parts from any of the pilot suits that you have purchased. once you have chosen your look, you can now save it to the new save slot system, kind of like a wardrobe for your Commander.

There are many quality of life changes too, expansion of the synthesis recipe system to include heat sinks, chaff, limpet drones and even topping up your emergency life support system. These coupled with the introduction of hull and canopy repair drone control modules, will greatly increase the self sufficiency and sustainability of explorers and combat pilots alike; so long as they have the materials.

The listing of 'Mysterious locations added that we're not going to tell you about', is about as obvious as a neon sign in saying there is much to this beta that is tucked away.
Full patch notes are found on the Elite Dangerous forums here.