Turning up on Kickstarter is the Oceania project. The game's self-described as, "Oceania is a endless fantasy world, which lies amidst the vast expanses of the ocean. Land is represented here as a multitude of separate surface and flying islands of various shapes and sizes...From time to time new islands or even continents arise from the depths of the ocean. Two neighboring races, humans and elves, actively explore new lands, sparking wars over the territory. In order to amass greater power, humans and elves create clans and guilds, which build new cities and kingdoms and attack each other, trying to invade other kingdoms to expand their own borders."
Making the game notable aside from the plans for native Linux support is that the MMORPG is being powered atop the visually great Unigine Engine. Unfortunately there still aren't many games (whether it be for Linux or not) powered by the Russian-made Unigine Engine. The engine is visually stunning and it continues to get even better, but unfortunately it just hasn't seen much traction among game developers.
In terms of the Linux support, the Kickstarter page mentions, "Yes. With support of UNIGINE Engine platform GNU / Linux. Next stage after creating version for PC, porting to Linux. Further, for mobile platforms."
Right now Oceania isn't off to a compelling start, but hopefully its pace will increase so we see a Unigine Linux MMORPG.