I think they put those files into client time-to-time, just to prevent high load on download servers (imagine all that amount of players downloading like 50mb of data each)... So, they puts it into client part-by-part, so, users downloads 5 mb, then another 3 mb etc... Also...
It would be pretty interesting to see "Silkroad 2" as most of people calls it (was it announced from trustable sources?). I hope it's going to be something more than just new char models & dx10/11 graphics support, haha... I mean, they shouldn't ***k up gameplay we love so much in current sro, but there should be something really amazing & awesome - radical innovations. I think, Joymax has ability to make a game which would be even better than Silkroad as we know it at the moment. I'm pretty sure they got some pretty creative imployees.