My understanding is that there will be special election within six months.
Replacements? Current Lt. Governor Lee Fisher was AG, while best AG assistant is former state Senator Ben Espy. However Strickland is considered a potential VP nominee (although a die-hard Hillary supporter) so he may want Fisher to stay in line to become Governor. But Fisher and Dann are both Jewish, if that is a consideration.
Espy has high integrity. A Woody Hayes football player, former Columbus councilman, served in several AG administrations, African-American, and natural counter-balance to Columbus Mayor Coleman.
If Dann leaves office prior to September 24th there will be an election held at the General in November. But if he hangs on past 9/24 Governor will select someone for the next two years until end of term: http://www.cleveland.com/news/plaindealer/thomas_suddes/index.ssf?/base/opinion/1210408262299340.xml&coll=2