Voice Chat means talking, you have to talk to the Customs officer to get onto a ship to go to Karamja, Karamja has a port, a port means there is boats, and boats means there is sailing! OH MY [bleep] GOD! It's not happening.
In all seriousness, it could be Night/Day RuneScape, which would be quite interesting, could this mean that your character would actually need to sleep? Sleeping could induce things like making beds for the Construction skill, I mean, honestly I don't really know, but It would be pretty cool, a lot of things could lead off of it. Who knows what JaGeX has up their sleeve this time.
Legs O Skill
Hopefully not sleeping, again.