The two versions of Tweetbot, one for iPhones and iPod Touches and the other for iPads, have been updated to version 2.8.2 and now support Instagram video according to the release notes, although there have been some reports of the feature not working at all.
The Twitter #music update is a bit more substantial, bumping up the app to version 1.1 with the addition of genres:
Genres! Get hip-hoppy or get your metal on or get your dance beats grooving with Twitter #music genres! Tons of genres plus Superstars, Popular, Emerging, Unearthed and Hunted charts.
This build also includes: • Fixes for some scenarios that could cause tracks to be unavailable. • Rdio authentication now happens in-app, rather than kicking you out to Safari. • We have stomped many bugs so that you don’t have to.
The free Twitter #music app is available in the App Store.