A very good blog post by Ben Ari from Microsoft on future directions for the TMG firewall.
Well, maybe future “directions” isn’t the right term, since the TMG firewall has been retired – though the good news is that it will be fully supported until the year 2020. That shouldn’t be a problem for most of us, since many of us are still running Windows Server 2003 in production 
Check out Ben’s thoughts on this subject over at:
http://blogs.technet.com/b/ben/archive/2012/12/12/tmg-directions.aspx
HTH,
Deb
DEBRA LITTLEJOHN SHINDER
MVP (Enterprise Security)
“MS SECURITY”
[email protected]