Definitely thinking the 2-hour premiere is just legs 1 + 2 aired back-to-back. The leg in London seems far too short to warrant stretching over 2-hours. Now maybe if the TAR32 premiere was 2-hours, I could see the leg 1 Trinidad & Tobago leg fitting that since that leg had so much going on in it + it had a mid-leg Overnight Rest, but definitely not for TAR33. If anything, this makes me think that the premiere will end on a cliffhanger of the production shutdown at the very end of the episode.
Also, the last time TAR aired in January opposite the Olympics was season 30 back in 2018, so I assume that this season will have a very similar schedule to that one. If anyone remembers, TAR30 aired 12 legs in just 8 weeks. They doubled up 2-hours a night four times to burn through the season quickly for Survivor to start, so I think that will happen again here. Survivor 42 is set to premiere March 9 so I think the TAR33 finale will be one week earlier on March 2. So this season will air over 9 weeks if that's the case, just one week longer than TAR30.
Personally I'm not a big fan of CBS doubling up the episodes, I like to enjoy each episode as it's own standalone leg, but I guess if they want to burn the season off before Survivor, starting off with doubling the premiere (which only happened once back in TAR15) is what they're gonna do. The only other thing I wonder is how many legs were shot this season, if it's still the usual 12, or if it was less. If it was less then there will be less double episodes than TAR30 for sure.