Some of us don't have tro 3150. After buying all the pdfs I decided against the print collections as well. I have gad A LOT of other expenses this year...
TRO 3150 doesn't tell us much anyway. There are teasers, but that's it. It entices conjecture about whether or not New Avalon has been captured rather than actually saying it did fall, for example. The plot details that are given are so few and narrowly focused that the "is it a joke or isn't it" ilClan timeline where the HomeClans invade the Inner Sphere could already be underway while being compatible with what's given in 3150. (I'm not saying it IS underway, mind you.. just that due to the lack of coverage on the big picture presented in TRO3150 leaves
that much room open for a possibility of that magnitude)
So there's certainly room for the Republic to have unveiled any manner of nasty surprises that were deliberately not (yet) mentioned in TRO3150 so as not to spoil the official/real ilClan plot.