A sentient race on par technologically with us in the EU or maybe even a little more advanced in some areas. Just like humans some of these beings are good and can be traded with while others are evil and have more dire plans than the robots.
I think a planet full of giant mobs(on the scale of Eomons or larger) would be cool and the only way to hunt them is from vehicles it would be a nice way to introduce vehicles.
If we are going to have planets let us have space flight too. I have been land locked far to long and the glorified TP we call ships now are just well not very enjoyable. Maybe partner with Egosoft and integrate something like X3 into the Entropia Universe.
While not a planet maybe make a space pirate base a "Den of thieves" sort of thing. A place where you can acquire certain things that might be considered illegal elsewhere but are used to create power equipment. Piers Anthony's Bio of a Space Tyrant series of books has some great ideas for all types of planets, ships, pirates, and the such.
I think an Industrial planet like IX in the Dune series of books would be a wonderful place for crafting, inventing, and science.
A water planet with very little or no land mass.
While we have CND which is an Asteroid resort maybe expanding upon that theme at CND would make it the "Las Vegas" of the Galaxy.
A Robot Planet would be interesting if it was made larger than life with epic scale proportions. Think of the Robot City in the Matrix and the massive drilling machines and so on and so forth.
Also a way to harvest gas giants would make it an exciting venture for enterprising space miners. It would take all types of specialized ships and equipment.
Also if they are going to build an actual Universe they should allow for Planet prospecting in a way. Allow players the ability to find uncharted celestial bodies and claim them.......well if they have not already been claimed or harbor sentient beings which won't take kindly to you taking their world.
Space factories would be interesting too.
Nomadic space faring races would add interesting elements to certain systems. Some might be neutral and trade to the owners delight others might be raiders you need to defend against.
Above and Beyond all this there will need to be an Empire or Confederation or Republic of some sorts to hold it all together.
Pehaps a planet that is completly mobfree. Yeha a planet whit just robots that would be great
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