As Jay said, Roulettes are an area we have been discussing for some time.
What we achieve in Edition 11 will depend to some extent on how long it takes us to review existing data and add all new releases and finds since Edition 10. By the time we go to print I estimate there will be some 4,000 - 5,000 new chips added. This alone will add 70 pages to TCR so it may be that even by reducing all roulette issues to one line we would not be able to condense the catalog to one volume.
Our primary objective as of "today" is to publish Edition 11 sometime before the 2009 convention, with all new releases and finds added, and values of existing chips modified where required. We won't even set ourselves a target publishing date until the 2009 convention dates are agreed. Then, depending on time, we may review our objectives.