Not exactly iOS news but Guitarism developer Rhism contacted me today with the news that Guitarism is now available for Android devices ... and I'll grab any excuse to talk about Guitarism!
Rhism says " Its now live on Google Play as well as the Samsung App Store ... and it includes all the guitars & effects plus the one feature that hasn't made it to iOS yet - custom chords :)"
It's great news since the wider customer-base an App has, the more likely the developer will garner the resources to keep up development. Relatively recently Guitarism dropped the IAP's to get the extra guitars, effects and MIDI output including it all in a single $4.99 purchase. That represents incredible value ... so if you haven't tried it yet I encourage you to do so! I've yet to encounter better!
I have a deep review of Guitarism here. It's out of date ( update on the to-do list ) but it will give you the basic idea.