Microsoft released Rollup 1 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 2.
Issues that are fixed in this rollup package:
2654016 A client may be unsuccessful in accessing a Java SSO application published to the web in a Threat Management Gateway 2010 environment
2653703 You receive an "Error: Subreport could not be shown" error message in the User Activity or Site Activity report in a Forefront Threat Management Gateway 2010 environment
2654585 UDP packets may become backlogged when you increase the "Maximum concurrent UDP sessions per IP address" setting in a Forefront Threat Management Gateway 2010 environment
2624178 Threat Management Gateway 2010 administrators may be unable to generate reports
2636183 Both sides of a TCP connection are closed when the client or remote application half-closes the TCP connection in a Forefront Threat Management Gateway 2010 environment
2653669 Summary information for the Top Overridden URLs table and for the Top Rule Override Users table display incorrect information in a Forefront Threat Management Gateway 2010 environment
2617060 Forefront TMG 2010 enables L2TP site-to-site connections in RRAS
2655951 Japanese characters in the subject line of an Alert email message are not readable in the Japanese version of Forefront Threat Management Gateway 2010
2654068 "The Web Listener is not configured to use SSL" warning message may occur when you configure a Web Listener to use a valid SSL certificate in a Forefront Threat Management Gateway 2010 environment
2654074 String comparison may become case-sensitive when you publish a website by using Forefront Threat Management Gateway 2010
2658903 The Forefront Threat Management Gateway Firewall service (Wspsrv.exe) may crash frequently for a published website secured by SSL after you install Service Pack 2
Note that along the lines of products like Exchange, cumulative updates for ForeFront TMG are now also called Rollup instead of Software Update or Update.
You can request ForeFront TMG SP2 RU1 directly from support here.