We've confirmed that the dae.bin has changed in the new Xbox 360 Fall 2011 Preview Dash (2.0.14686.0). c4eva has reported to the team that XGD2 and XGD3 backups are still booting under LT+ v2.0/2.01 (from team channel: [2011-11-10 08:58PM UTC] <c4eva> backups,xgd3 still booting). However, do not take this as a sign that everything is fine. Booting backups with older AP25 replay sectors on 14686 may get you flagged. Don't say we didn't warn you! We can confirm though that these changes will indeed necessitate new versions of and/or changes to Xbox Backup Creator, abgx360, and several other associated tools. It has also been confirmed by the team that drive fw's are not affected. All the changes are currently being analyzed, and we'll continue to update this post when further details become available.
*UPDATE* [2011-11-14 04:12PM UTC]
There is still a lot of analysis to do. Unlike the changes to the dae.bin in the previous updates, this time around the changes aren't so simple. In addition to possibly having to re-burn/re-press, accommodating the changes has a ripple effect across XBC, abgx360, other associated/internal tools, as well as potentially the fw itself. Right now it's too early to make any definitive statements. It should be clarified in the original post where mention was made that "the drive fw's are not affected" — this was not in reference to c4eva's fw, but rather to the ofw re-flashing of non-updated drives. The fw versions those drives get updated to has not changed in this update (e.g. Lite-On phats to 02510C, and Lite-On slim 9504 to 0272). The team appreciates your patience. More concrete info about what these changes entail will be posted in the days ahead as analysis progresses.