While there are a couple of rumors that Microsoft might launch/integrate its own Twitter client into Windows Phone 7 or Twitter itself might release an official Twitter client, Seesmic has just released a video preview of its upcoming Seesmic client for Windows Phone 7. According to the video, Seesmic is strictly following the Windows Phone 7 design. In addition to Twitter, Seesmic for Windows Phone 7 is also supporting Facebook; while Google Buzz wasn't shown. Seesmic for Windows Phone 7 features several spaces incl. search and trends as well as it supports status updates incl. photo upload, profile, retweets and geotagging. Direct messages even look like Windows Phone 7's SMS integration.
All together, Seesmic for Windows Phone 7 seems to be a pretty complete Twitter and Facebook experience. However, no word yet if and how deep it links to Windows Phone 7's People hub which leaves it open if Twitter updates will also be shown there.
Nevertheless, Seesmic for Windows Phone 7 is announced to "come soon"; most likely it will be ready as soon as Windows Phone 7 is available.
Cheers ~ Arne