Package: debian-installer
Version: 20150107
I've tried using each beta2 + a daily image (from 20150109) to install debian on a laptop, which already had partitions in place. This includes an EFI partition, which was formatted on a previous distribution using "mkfs.fat -F32 /dev/foo"
During installation of jessie, the installer recognized the partition well, and allowed me to delete the contents. However, it refused to easily allow me to format it, always opting to keep the data (shown with a "K" in the summary page).
I suspect that the debian installer wasn't quite sure how to handle it being 32-bit, as the D-I seems to prefer and use 16. As a result, the partitioning failed. I was eventually able to go back, and after some selecting/un-selecting, finally noticed that the installer flagged the partition with "f" for format.