When tech bloggers discovered an icon for the popular mobile game Angry Birds in a Windows Phone 7 promotional image, it seemed like confirmation that the game is coming to Microsoft’s smartphones, but the developers behind Angry Birds tweeted a denial of any commitment to the platform.

Microsoft reps then sent a note to TechFlash admitting that the image was a mistake. “It appears information was mistakenly posted to Microsoft’s website, and has been removed,” the statement said.

Microsoft will need developers like Angry Birds developer Rovio to make Windows Phone 7 attractive to iPhone () or Android () users who are accustomed to having a large selection of high-quality apps. Rovio said it was not thrilled because, “We don’t like others using our [intellectual property] without asking.”

However, we don’t want to overstate the blunder. We expect that Microsoft and Rovio will both move on and work together if the market for a Windows Phone 7 version of Angry Birds is there and waiting to pay for it.

Rovio even admitted as much in later tweets: “Nothing to do with if we do or don’t, it’s just that we decide that for ourselves … We could do a WP7 version of Angry Birds, not the issue. We have not agreed to do that (yet). Will support all relevant platforms.”

Angry Birds is a standard-setting iPhone game that also appears on Android, webOS and some Nokia phones. It has sold at least 6.5 million copies to date, so it’s a perfect example of an app store success story — a story Microsoft would like to see told on the Windows Phone 7 platform, too.

The new game Def Jam Rapstar from Konami and 4mm Games isn’t just a hip hop karaoke game or a challenging performance simulator like Rock Band 3. It’s a social media platform for building connections, promoting yourself, speaking your mind and maybe (just maybe) becoming an actual rap star.

We were given a behind-close-doors tour of the game by representatives from Konami, 4mm Games and Def Jam Enterprises, and we learned most of the details about the core music game play and the social media “metagame” that’s attached.

The Music Game

The game itself is similar to other karaoke games; you pick up a microphone and rap along with the track you’ve selected, and the game grades you on lyrical accuracy, timing and other musical factors.

Songs are presented with their music videos, profanity-free, though you’re free to use the harsh language from the original recordings if you want — it won’t affect your score.

You can even play in Duet mode, bringing your friends in to perform different parts in a song with multiple performers. Konami will offer new songs for download weekly, starting on day one.

There are several other modes, but the most unique and exciting is the Freestyle mode. We’ll talk about that alongside the game’s social media features.

The Ambitious Social Features

The social features of the game are tied primarily to the Freestyle mode, which you can use to rap on top of original beats and samples provided by Konami. As you lay down your audio track, the game uses your game console’s camera (the PlayStation Eye, the Xbox Live Vision Camera, and probably Microsoft Kinect) to record your performance on video.

You can edit the video afterwards, throwing in special effects and graphics, then post it to Def Jam Rapstar’s online community.

Links to videos and other updates are sharable on Twitter, Facebook and MySpace, but it’s not just about socializing. A whole game is built around a system of rap “battles” between users who upload video challenges to one another. Winners of battles (and MCs who accomplish other objectives) gain badges similar to the Xbox 360’s achievements.

All the profiles, news feeds and videos from Rapstar’s community are viewable by anyone on the web whether they have a game console or a copy of the game or not.

You can join crews, find followers and fans, or even strike up rivalries — either by challenging someone to battles frequently, or by getting kicked out of your crew. That last one will make you a rival to everyone in the old crew.

There are even roles for people who don’t rap. Promoters have their own metagame; they gain badges for using social media to spread the word about their favorite artists.

Becoming a Real Rap Star

Konami, 4mm and Def Jam Enterprises see the game as a breeding ground for new talent, and they’ve designed the Freestyle mode and the online tools with artists’ self-promotion and expression in mind.

They’ll cherry pick the finest talent — rappers who stir up vast armies of fans with superior lyricism, timing and pitch — and put them in professional production studios to create featured content for the network.

That would seem to fit with the hip hop ethos of coming from nowhere to conquer the whole world.

The game will launch on the Wii, PS3 and Xbox 360 with at least 40 songs and videos from artists like Dr. Dre, 2 Pac, 50 Cent, Ice Cube and more this October 5 in North America and November 2 in Europe.