1) 18 people - I can see that
2) 3 Nom and 2 gone - a bit extreme, I find it doubtful (3 months = ~13 weeks, 18-13=5, with 1 3/2 and 2 DE you have 2 left, unless there is a returning player in middle)
3) 2 double eliminations - if 2 then redundant and doubtful, if not 2 then plausible (though likely more than 2)
4) HoH can participate in HoH - Interesting, but doubtful, too much potential power for a strong player (I could see Jeff winning back to back to back)
5) The Ultimate Golden Key - I find it kinda wow/boring... 'Here, you are guaranteed 'jury' or better on day 1/2/3!' - can holder win HoH prior to 8 left?
6) Laura (Surv 19), Colton (Surv 24), Joey Fitness (TAR 20) - Would explain Colton not being on S26, but rather doubtful.