I predict that there will be no cloture abuse on the Alito nomination, and that the languishing Circuit Court nominations will not be advanced. To do so would risk confronting the abuse of cloture, and the GOP-lead Senate is averse to that confrontation.
has Bush said anything about naming Roberts' replacement to the DC circuit?
Not that I know of. Neither the Judiciary Committe material not the WH announcements contain any nominations since July 29, 2005, other than Roberts to CJ, Miers and Alito.
http://www.whitehouse.gov/infocus/judicialnominees/
http://judiciary.senate.gov/noms/109.pdf
I suspect you are right, that the Dems will NOT filabuster Alioto, and the GOP will roll over on the rest..however. there is ONE scenario to upset that applecart...Frist is a lame duck leader, so the candidates to replace him may try to gain support, and traction, by forcing the issue. I can easily visualize McConnell willing to make his bones on this..