I expected that question.
tor 0.3.0.7 reached the deb.tpo repos
Just to make sure I don't misunderstand: As of today, should using
deb http://deb.torproject.org/torproject.org jessie main deb-src http://deb.torproject.org/torproject.org jessie main
result in Tor 0.3.0.7 being used?
No, only if you choose the 0.3.0.x repos on deb.torproject.org
The 0.3.0.x repos got updated to 0.3.0.7 (from 0.3.0.5-rc). That was the important part in the context of TROVE-2017-002 since tor prior to 0.3.0.1-alpha is not vulnerable.
If you want 0.3.0.7 regardless, you will have to adjust the sources.list file, as Roger suggested, the stable repos will probably stay at 0.2.9.x and that is fine (LTS release).