The main thing I noticed that changed was the token stores packages where changed so for example:
<bean id="tokenStore" class="org.springframework.security.oauth2.provider.token.InMemoryTokenStore" />
becomes
<bean id="tokenStore" class="org.springframework.security.oauth2.provider.token.store.InMemoryTokenStore" />
Also previously in 1.0.5 I had used the TokenServicesUserApprovalHandler which I could no longer find in any of the packages. I removed the reference to that class and user-approval-handler-ref="userApprovalHandler" I had added to the oauth:authorization server. Mines seems to be working now on 2.0.5, hope this helps.
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