I don't perceive really noticeable bias on local newscasts on either Pittsburgh commercial news-talk station. KDKA-1020 and WPGB-104.7 both appear to be straight-arrow on that count. Occasionally, I do hear KDKA newsmen and talk show hosts having differences of opinion in the banter that might follow a newscast.
KQV-1410 also has been fairly straight-arrow in its local reporting. It is all news all day though it does have Laura Ingraham on tape in the evening and now runs an ABC talk show overnight.
WESA-90.5 probably will wind up just as straight-arrow, though I do question that certain sorts of topical coverage get funding, much like the old days (and even some new days) when certain types of commercial TV and radio news and sports programming had sponsors.
My belief is that WESA (the old WDUQ) still is shaking down under new management. There are more local news breaks, given the additional news-talk programming there, from NPR, American Public Media, the BBC and some combines that include the BBC.
The other news-talk outlets in the market, WAVL-910 and WMNY-1360, do not do local news, though WMNY runs an hour of WTAE-4's newscast (Channel 4's audio is the basis for much of the local news on WPGB, too).