Trac is the place to follow along with the development of WordPress for iOS. You can see recent changes in the Timeline section of this site or track the changers using the RSS feed.
Bugs reports are also kept on Trac. Click New Ticket to report a bug. First Login using your WordPress.org username and password. If you don't already have one, sign up at the forums.
You can browse the source here, but you probably want to svn co http://ios.svn.wordpress.org/trunk/