^ There is no change in the selection process for Worlds, either for 2009 or 2010. The National Champion goes. If there are additional spots, the USFSA International Committee selects the participants based on
Placement at the last two US championships,
Last years Worlds,
Four Continenets,
Other nternational events,
The ISU ranking system
(listed in this order in the by-laws, page 67):
http://www.usfigureskating.org/Content/2008-09 RB Part 1 Bylaws.pdf
For the Olympics (only) the USFSA International Committee has more leeway and is not necessaritly required to send the national champipon.
IIRC the USFSA in the past took great pride in not playing political games -- like all those bad federations do

-- in the selection process. The top guys at nationals go, period, except in case of injury, like Nancy Kerrigan, Todd Eldredge and Michelle Kwan. They figured this was the moral high ground. Other fedeartions, like Russia, were accused of various schenanigan's like favoritism to the students of influential coaches, etc.
In the last Olympics the Japanese federation was criticised for following a point system that allowed Miki Abdo an undeserved spot -- the charge was that Miki pulled in a lot of money through endorsements and the Japanese federation would suffer financially if Miki didn't go.
Supposedly the USFSA was above all that.
Recently, though, there seems to be a sea change. USFSA folks are talking more and more like "sending the best team" (in the judgement of the USFSA brass) is more important than sticking to a hard and fast rule.