Well, maybe not a scrubbed launch, but what about some launch aborts like RTLS and TAL? Wouldn't this be cool?
It would even be somewhat in tradition with STS-401, which was last Christmas' mission, as this was a "what-if" scenario that was actually planned in real-life as a contingency, but luckily was not needed. RTLS and TAL are also planned and trained for by the astronauts as contingencies, but luckily they were also never needed (and hopefully will not be needed for the few remaining Shuttle missions). So, in this respect, a "launch abort training mission" would be the perfect successor to STS-401 as a "Christmas Mission".
I guess, tomorrow we will know...
Merry Christmas, my fellow "simnauts"!