The CW has announced it’s fall schedule.  It includes
switching around some shows and reteaming it’s previous Thursday night
lineup of Smallville and Supernatural on Fridays.  The
breakdown (via THR.com):

Monday
8:00-9:00 PM – 90210 (new night)
9:00-10:00 PM – Gossip Girl

Tuesday
8:00-9:00 PM – One Tree Hill (new night)
9:00-10:00 PM – Life Unexpected (new night)

Wednesday
8:00-9:00 PM – America’s Next Top Model
9:00-10:00 PM – Hellcats (new series)

Thursday
8:00-9:00 PM – The Vampire Diaries
9:00-10:00 PM – Nikita (new series)

Friday
8:00-9:00 PM – Smallville
9:00-10:00 PM – Supernatural (new night)

In other news, The CW leaked some show details / minor spoilers in their Upfront press release.  EW.com’s Michael Ausiello had the details on Smallville and Supernatural and other shows:

Smallville: “Season 10 promises the classic
reuniting of the timeless romance between Clark and Lois, and brings
Clark face-to-face with his destiny as he overcomes his final trials
and forges the iconic identity that will be known for all time.” (FYI: Cassidy Freeman (Tess) is included in a list of returning series regulars. Hmm…)

Supernatural: “Season six will be a season of
mystery and shadow. Heaven and Hell have been left in complete disarray
since the apocalyptic events of season five. And now, monsters, angels
and demons roam across a lawless and chaotic landscape. And so Dean
Winchester, who has retired from hunting and sworn never to return,
finds himself being pulled back into his old life — pulled back by none
other than Sam Winchester, who has escaped from Hell.  The two reunite
to beat back the rising tide of creatures and demon-spawn, but they
quickly realize that neither are who they used to be, their
relationship isn’t what it used to be, and that nothing is what it
seems.”

Ausiello also reported the details on Smallville’s Allison Mack departing the show as a regular.  Mack commented the following:

“It’s amazing to think that Chloe Sullivan and I have been one and
the same for over a third of my life,” says Mack in an exclusive
statement. “I’m truly humbled by the love and loyalty of all the fans
whose enthusiasm has carried me — along with a cast and crew that has
become my second family — over the past nine and a half years. Out of
respect for the amazingly loyal fans and the place I will always have
in my own heart for Chloe, I’m coming back for several episodes next
season to tie up Chloe’s Smallville legacy properly.  It’s been a life-changing ride,” Mack concludes, “and I look
forward to what lies ahead with the strength of a ‘superhero’ as my
foundation.”

Lastly, it’s now confirmed that Season 10 of Smallville will be the show’s last.  The one confirming was Tom Welling himself…a little early apparently:

The CW was hoping to announce at its upfront presentation Thursday that next season of
Smallville
— the show’s 10th — would be its last. But Welling — who was expected
to deliver said announcement in person — jumped the gun and blabbed it
to the press last night. 
“Season 10 of Smallville will be the last season,” Welling told Hollywoodlife.com last night at an event in Beverly Hills.