Also, though nothing official, the network also expressed a lot of confidence in Heroes receiving another season.
However, 2 shows that didn't receive such good news were freshman series Kath and Kim and Knight Rider. Said NBC at a press conference:
"The two shows were 'fair tries' but aren't holding up in the ratings" and are "indicative of shows that may or may not be coming back".
Start your "Save this Show" campaigns now, if you care...
Source: NY Times