Yes. WhatsApp Messenger offers backup and restore options. You can backup your chats to an encryted file(now *.db.crypt5) or restore chats from backup file back to your android. But restoring history from a backup would wipe your current chats with those in the backup.
If you want to switch history from old phone(backup file) to a new phone, try a 3rd party tool named Backuptrans Android WhatsApp Transfer. It provides a simple way to merge chats between android phones.
Good luck!
