There are Todd Howard keynote highlights from QuakeCon 2009 on Big Download recapping what the Bethesda Softworks executive director had to say at the show. Todd says they are currently working on their "next big game," which they are not discussing further, and that Bethesda is done making Fallout 3 DLC, though the third-party DLC Fallout 3: New Vegas is expected next year. As for the Elder Scrolls series, Howard says there are no current plans for Elder Scrolls 5, but when asked about an Elder Scrolls MMOG he said "there's always a chance," though they indicate this was said "in jest." Thanks Kotaku. On a related note, though Big Download says the comment about the Elder Scrolls MMOG was in jest, the Trademark sleuths at superannuation have a list of domains that currently resolve to Bethesda's name server at ns1.zenimax.com:

elderscrollsmmo.com
elderscrollsmmo.net
elderscrollsmmog.com
elderscrollsmmog.net
elderscrollsonline.com
elderscrollsonline.net
theelderscrollsmmo.com
theelderscrollsmmo.net
theelderscrollsmmog.com
theelderscrollsmmog.net
theelderscrollsonline.net