Thousand Sons Preview UpMy short reaction is this: Magnus! (everybody else sucks)
Like, I think the All is Dust rule is cool and fluffy, but it isn't going to save the hyper-slow rubrics from fiery death, especially not now that their invul save took a hit.
The Aspiring Sorcerer's ability is an utter joke (talked about this already).
I think to some extent I'm going to need to see how much everything costs to field, but everything I've seen so far implies that the Ksons still cannot kill vehicles and psychic power continues to be pretty terrible. In this past edition, it was hyper complex and unreliable, but at least it did actual work when it decided to function. Now? Both modestly unreliable and offensively weak. Having trouble seeing myself build an army where psychic power is key to success.
EDIT: All that said, if Tzaangors get magically better and I can field more guys, you might seem me taking a Ksons force that doesn't really need Psychic power to function. Seems...contrary to fluff, but I've done it before in 4th Edition.