Nothing but a marketing gimmick.
The external connection would be TBolt, a connection that's currently a rarity. But what about the internal connection? Intel's 510 series use the SATA3 bus which means the TBolt connection will be bottled down to SATA3 speeds. You won't get any advantage from TBolt's extra bandwidth, and since TBolt is using an electrical connection currently, there are also no latency advantages from optical transmission.
All it really is is Lacie wanting to say they have a TBolt enabled product. This is still not a useful mainstream tech