Microsoft today released updates for Skype for iPhone and Skype for iPad. This v4.12 update brings better call quality, accessibility improvements, and the new ‘Join Call’ button for group voice calls.
✓ Join ongoing group voice calls right from your iPhone or iPad, as requested by many of you in the iTunes app store.
✓ Voice and video call quality improvements.
✓ Accessibility improvements.
✓Get help by accessing FAQs from the app.
✓ General fixes and speed improvements.
Source: Skype blog