Soon after, Brett Yount from Bing responded saying:
We might once we complete the rework of that tool, which will be Fall earliest. Good news is, there are some changes in the works due in May/June to many things important to the webmasters frequenting these forums.
So there are two things here:
(1) Bing's Page Score may come to their Toolbar. (2) They will be reworking "that tool," which I believe is talking about Page Score specifically.
Forum discussion at Bing Forums.