I can't find blendColor() in the new reference, but it seems to work as expected under 2.0, though I haven't thoroughly tested this.

Also can't find anything about changes to it in the Changes wiki, or revisions.txt.

Has it been / is it expected to be officially deprecated, or is it a reference oversight?

If the former, what replaces it? If the latter, where is the proper place for me to log the omission?