The first update of 2014 has hit Nether along with the addition of motorcycles and dirt bikes, in addition to bug fixes and feature enhancements. Besides the new mode of travel, players can also take advantage of new group features including chat, map markers and more.
Group System- Group chat, group members show up on map, easily identifiable nametags
Group system overview/instructions:
• Access the group screen from the main menu bar.
• Invite people to your group by clicking the plus icon next to their name in the right most column.
• Invites appear in "invites" window. You can accept or ignore them. Accepting an invite, while your currently in a different group will cause you to leave that group.
• You can send chat messages to only your group members by beginning your message with /group.
• You can return to global chat by typing /say.
• Group member's name tags always appear over their heads.
• Group member's locations can be seen in the map screen.
Check out the full patch notes on the Nether forum.