You can see the tweets and can also tweet from the Google wave. For this
1. Just add tweety-wave@appspot.com to your contacts
2. start a new wave with tweety
3. It will popup a window and you will have to authenticate to access twitter
4. grant access permission on next page
5. You can view the tweets and also update your status through this wave now
If you don't have a Google wave account , try your luck here