differences between s/w upgrades of world in box

satellite_2004

hi guys ;

any one knows the differences between upgrades of world in box?there is an upgrade ( 27 november ) and another ( 29 november )..there is no diiferenced between them when i download each of them..the only different i can notice is that in the 27 nomvember upgrade ; there was a new menu under game which read as "hcas mode on/off"...but in the new version (29 november) there is no trace of that menu..also i can add that the file size of the newest upgrade (29 novemeber) is bigger than the previous one..i wanna know whats that "hcas mode on/off"? and whats the reall differnced between these two recent upgardes?