I DID play a Shardmind Battlemind! Or was that a Battleshard MindMind?
Much like the plasmoids are now, and how Tieflings and Dragonborn have become, with a large amount of variety to the artwork (colours, markings, horn-size, etc), the Shardmind (that badly needs a different name) ought to be a wide variety of crystal-like people, rather than an ugly red spikey rock-thing. Had it been so, it might have been more popular. They could bring it back that way, but it was widely known to be the absolute least popular 4e race, so I doubt we'll see it ever again.