I don't want to compromise DL by posting "insider" info. I am sure that delta.com will be updated shortly, and as YOU run into employees as I did today, I am sure they will be happy to share the good news with you.
But to answer the last question, your upgrade window will depend on your status and fare paid:
PMs can upgrade YBM at time of purchase
GMs can upgrade YBM at 100 hours
FOs can upgrade YBM at 72 hours
PMs can upgrade HQK at 100 hours
GMs can upgrade HQK at 72 hours
FOs can upgrade HQK at 48 hours
PMs can upgrade LUT at 24 hours
GMs can upgrade LUT at 12 hours
FOs can upgrade LUT at 12 hours
Companions are upgraded at 12 hours, but not on LUT fares.
Edited to note that if two individuals with different Medallion status, but the same confirmation window, request an upgrade, the higher Medallion status receives priority. If two individuals with the same status and confirmation window request an upgrade, the first person to request an upgrade receives priority.
[This message has been edited by andymo99 (edited Dec 17, 2003).]