I don't have any definite info, but I'm interested in this too - as I want to upgrade my HTPC with an E7200 cpu, but the lack of low-power Intel IGP board options is frustrating.
Did you see this comparison from the SPCR Asus G35 review?
http://www.silentpcreview.com/article785-page5.html
But the 4W difference could just be due to the different boards and the recent Asus s775 boards are known for their higher power consumption.
In the Anandtech G33 comparison from last year, the Asus G33 board was about 2W higher than the Gigabyte G33. So at idle, it looks like there isn't much between the G33/G35 chipsets themselves. The difference comes at load since the G35 is rated 28W TDP and the G33 about 13W TDP.
It's disappointing the Anandtech 8200/780G/G35 review didn't include a Gigabyte G33 board in the comparison. It should have faired a little better than the Asus G35.
With the G33, the best result I've seen so far is an undervolted E2140/Gigabyte GA-G33-DS2R setup idling at ~41W and load ~50W with the Sparkle SPI220LE:
http://blogs.zdnet.com/Ou/?p=934
Depending on the RAM/HDD, a Pico and undervolted E7200 should be able to beat this.
As an alternative to an AMD cpu and 780G/8200, I've been considering the combo of G33 / E7200 / Pico and HD3450, but the 3450 will add about 8W at idle / 20W at full load. Not a terrible option, and would perform well, but it won't be especially low-power.
If HD decoding isn't a requirement, another option could be the MCP73 based boards (but it only supports single channel RAM), eg GA-73UM-S2H:
http://www.gigabyte.com.tw/Products/Mot ... uctID=2689
Otherwise, for a better option, I guess we need to wait for the MCP7A or G45 and see how they compare. The MCP7A paired with an E7xxx cpu could be good solution. MCP7A launch is meant to be this month. Hopefully we'll see some boards soon.