Bitcoin Core 0.11.0 includes improved privacy functions as well, in particular because it connects to the anonymizing TOR
network more effectively. If TOR is enabled, the newest Bitcoin
software uses different TOR circuits to connect to different peers, as
opposed to one and the same TOR circuit
Tor already does this by default, you can look at the connection manager and see different tor circuits opening for different nodes. Its called stream isolation and applies to any program or website you use, furthermore circuits stay open for the duration of the connection so you dont get connections breaking while connecting to a particular service, this was done specifically for maintaining downloads through Tor and staying logged into IP-check based sites. Just looking at the Tor network map while using 2.0.3 shows that successful connections tend to stay open for the duration of the session, the crappy speed and mass rejections are not inherient to Tor except with services maintaining blacklists, such as anyone behind cloudflare (like this site).
Fundementally there is no difference from a nodes/websites perspective between serving a Tor exit node and serving a direct connection , other than its known that the exit is associated with Tor.
edit: Tor is TCP-only, are nubits nodes serving UDP or TCP?
