YouTube's Eileen Rivera posted the screenshot above on Google+, showing a lighter, more colorful design with more prominence given to the main store areas, and larger app icons below. "Games" also gets its own entry, whereas before it was found under "Apps."

These are the features as rumored:

• Access the same conversation list from anywhere
• A new, conversation-based UI
• Advanced group conversations
• Ability to send pictures
• Improved notifications across devices

Google Play 4.0 will likely be released at this year's Google I/O (Google Developer Conference)

Source: AndroidCentral