Google has updated Gmail for Android to version 4.2.1 that brings pinch-to-zoom feature for emails and a swipe to archive or delete to quickly delete or archive a mail from inbox.
New features in Gmail for Android v4.2.1 for Android 4.0 or later
- Auto-fit messages to screen and message zooming
- Swipe messages to archive or delete
- Attach photos and videos from within Gmail
- Larger photo previews and gallery view for photo attachments
- Bug fixes and performance improvements