Google has 11 days left to fulfill a promise made to T-Mobile USA's G1 owners that all of them would have been offered the Android 1.5 OS by that deadline. TmoNews has a source that has found what he claims to be a schedule from T-Mobile's internal systems. It reveals the rest of the distribution schedule for the Cupcake upgrade. By this Monday, 5% of the G1 population will have been offered the upgrade running up to 60% by next Friday. Within a week from the coming Monday, May 25th, 100% of G1 owners will have been offered the firmware upgrade. And for those new G1 buyers, you will receive an OTA notification 3 days after your phone is activated. While your parents probably told you how bad sweets are for you, this is one Cupcake that will be happily devoured by all owners of the first Android handset.