I know there was a part 3 that dloaded in the background but i think this was for the 4.0 patch. I also know that when i was keeping an eye on my usage etc that there was about 10x blizzard connections all up ( I only had 2x wows open). About 3 of these were dloading but im thinking it may be the part 3. cahnces are if its working on the new hb then its nothing. Maybe google around and see if theres any info on patch sites etc. good luck