Lots of folks have been asking about the cast of ASS2 or 2.5 or 3 or whatever we're calling it, but are also trying to avoid spoilers about what actually happens in the season. It's actually pretty difficult to find the cast without stumbling upon the purported bootlists as well. So here is just the cast in alphabetical order by tribe.

Keep in mind this information isn't 100% confirmed and won't be until CBS says so, but it's been corroborated from multiple sources, namely survivor300, SurvivorsUnite, missyae, and others.

If you are trying to remain spoiler-free for S20 then it would be wise not to click elsewhere in this forum, as spoilers may be present in thread titles.

Heroes Tribe
Amanda Kimmel (S15 China and S16 Micronesia)
Candice Woodcock (S13 Cook Islands)
Cirie Fields (S12 Panama and S16 Micronesia)
Colby Donaldson (S2 Australia and S8 All-Stars)
J.T. Thomas (S18 Tocantins)
James Clement (S15 China and S16 Micronesia)
Rupert Boneham (S7 Pearl Islands and S8 All-Stars)
Stephenie LaGrossa (S10 Palau and S11 Guatemala)
Sugar Kiper (S17 Gabon)
Tom Westman (S10 Palau)

Villains Tribe
Coach Ben Wade (S18 Tocantins)
Courtney Yates (S15 China)
Danielle DiLorenzo (S12 Panama)
Jerri Manthey (S2 Australia and S8 All-Stars)
Parvati Shallow (S13 Cook Islands and S16 Micronesia)
Randy Bailey (S17 Gabon)
Boston Rob Mariano (S4 Marquesas and S8 All-Stars)
Russell Hantz (S19 Samoa)
Sandra Diaz-Twine (S7 Pearl Islands)
Tyson Apostol (S18 Tocantins)

Breakdown by season
S1 Borneo - none
S2 Australia - Colby, Jerri
S3 Africa - none
S4 Marquesas - Boston Rob
S5 Thailand - none
S6 Amazon - none
S7 Pearl Islands - Rupert, Sandra
S8 All-Stars - Colby, Jerri, Boston Rob, Rupert
S9 Vanuatu - none
S10 Palau - Stephenie, Tom
S11 Guatemala - Stephenie
S12 Panama - Cirie, Danielle
S13 Cook Islands - Candice, Parvati
S14 Fiji - none
S15 China - Amanda, Courtney, James
S16 Micronesia - Amanda, Cirie, James, Parvati
S17 Gabon - Randy, Sugar
S18 Tocantins - Coach, JT, Tyson
S19 Samoa - Russell