Skeleton shoot faster

Intended feature as of 13w03a (if im not mistaken)

You are correct.

Patch Notes From Snapshot Release:
Improved Skeletons

• Now shoot from 15 blocks away, instead of 10

• Scales to difficulty

• They now shoot faster when their target is closer

• They shoot players one block away

I am correct, or not?

Yes you are right, skeletons shoot faster and yes this is intended.