YouTube’s ambitions to challenge cable television head-on are getting a big boost tonight: the world’s largest video site is announcing that it’s lined up a slew of new content partners who will be developing shows for the site, covering everything from sports to comedy to music. The news had been rumored for some time, including a report last week in the WSJ.

In a blog post announcing the news, YouTube says its goal with these channels is to “[give] you more reasons to keep coming back again and again”. The post references the so-called “defining channels” born out of cable, like MTV, ESPN, and CNN, and says that the next generation of these will emerge on YouTube.

These channels will start coming online next month (“continuing over the next year”, so some will take a while), and will be available anywhere YouTube is.

There are some big names on the list. But there are still a lot of questions: Will this content really rival the premium production values seen on cable? Will the shows be exclusive to YouTube? And how exactly is YouTube going to tweak the site’s user experience as it looks to shift users from funny cat videos toward these shows (which advertisers will be able to more effectively monetize)?

Here’s a list of content partners that are part of this announcement:

Electus Channel – Pop Culture (name TBD)
PMC PMC Entertainment News
WWE WWE
Young Hollywood Young Hollywood Network
DanceOn DanceOn (Madonna)
Fine Brothers Films MyMusic
Everyday Health, Inc. Everyday Health TV
TakePart™ TakePart™ TV
Digital Broadcasting Group (DBG) Spaces
Uncommon Content Partners The Conversation Channel
Demand Media eHow Home
SB Nation SB Nation
Magical Elves and InStyle magazine Little Black Dress
Hearst Magazines Channel – Fashion & Beauty Channel (name TBD)
Emil Rensing International Channel – Auto (name TBD)
My Damn Channel My Damn Channel: Live
Uncommon Content Partners Taste & Access
Red Bull Media House North America Red Bull
Machinima Machinima
Katalyst Thrash Lab (Ashton Kutcher)
Steve Spangler Science The Spangler Effect
New Nation Networks New Nation Networks
Smart Girls at the Party Smart Girls at the Party (Amy Poehler)
Bedrocket Media Ventures and Full Picture Productions Look TV
BermanBraun theLOGE
The Young Turks Town Square
BermanBraun & Rodale Inc. Vigor
Electus NuevOn – Latin Channel (Sofia Vergara)
Clevver Media ClevverStyle
ModernMom.com ModernMom Channel
Brady Haran DeepSkyVideos
IconicTV 123UnoDosTres
The Wall Street Journal The Wall Street Journal
Pharrell Williams i am OTHER
SoulPancake Productions SoulPancake (Rainn Wilson)
Chopra Media/Generate The Chopra Well (Deepak Chopra)
Clevver Media ClevverNews
The Bowery Presents The Bowery Presents
Clevver Media ClevverTeVe
Seedwell American Hipster
Hearst Magazines Car and Driver Television
Alchemy Networks Alchemy Networks
CafeMom CafeMom Studios
Bedrocket Media Ventures Channel – Comedy (name TBD)
Demand Media LIVESTRONG
Bedrocket Media Ventures Channel – Action Sports (name TBD)
FremantleMedia Channel – Pets & Animal (name TBD)
Big Frame BAM
IconicTV myISH
Electus Channel – Food (name TBD)
Soccer United Marketing & Bedrocket KickTV
Lionsgate Lionsgate Fitness Channel
East of Center Productions LLC YOMYOMF
EQAL u look haute!
Philip Defranco Sourcefed
Meredith Corporation and Meredith Video Studios Digs
Vlogbrothers CrashCourse
Walter Latham Digital Walter Latham’s “Kings of Comedy”
Tony Hawk’s production company, 900 Films, Inc. RIDE Channel
JON M. CHU Channel – Dance (name TBD)
Vuguru & POW! Entertainment Stan Lee’s World of Heroes
FAWN by Michelle Phan Fawn
DECA KinCommunity
Source Interlink Media Motor Trend
The Nerdist Channel The Nerdist Channel
Comedy Shaq Network The Comedy Shaq Network (Shaquille O’Neal)
Demand Media eHow Pets & Animals
Brady Haran numberphile
Cooking Up a Story Food Farmer Earth
Bleacher Report Bleacher Report
TED Conferences TEDEducation
Intelligent Television Intelligent Channel
Pitchfork Pitchfork TV
Vlogbrothers SciShow
EYEBOOGIE POP SPOT
Roadside Entertainment/BAC The NOC
Alli Sports Alli Sports
The Onion Onion Broadcasting Company
VICE VICE
Smosh/Alloy Digital Smosh Animation (name TBD)
VICE Noisey
Knights of Good Productions Geek & Sundry
Mondo Media New Animators
BermanBraun & Rodale Inc. Taste
Varsity Pictures Awesomeness
Black Box TV Black Box TV (Anthony Zuicker, founder of CSI)
IGN Entertainment / Shine Group START
@radical.media Channel – Education (name TBD)
Frederator Networks Channel Frederator’s Cartoon Hangover
monotransistor werevertumorro
Thomson Reuters Reuters.com
Slate Slate News Channel
Maker Studios The Maker Music Network
Maker Studios The Moms’ View
Maker Studios Tutele
Noisey VICE
Iconic Life and Times (Jay-Z)