In a recent Tumblr post, Maro said that there would be no returning named mechanics in Kaladesh: http://markrosewater.tumblr.com/post/149447709733/in-an-effort-to-make-this-speculation-season-more.
This reaffirms that Contraptions will not be in the set, even though it has already been said several times. (because assemble is a mechanic)
This means no Affinity, Metalcraft, and no Meld. (Meld would’ve been nice to see. Machines combining 🙂 )
This doesn’t really tell us much about what will be in the set, but it does rule out some possibilities.
From Raptorchan on MTGSalvation:
When we’ve seen any standard block without returning mechanics last time?
SOI – Madness
BFZ – Landfall
Tarkir – Morph
Theros – Scry
RTR – Hybrid mana (edit: Spilt Cards)
Innistrad – Flashback
Scars – Imprint
Zendikar – Kicker
Alara – Cycling
It’ll be cool to see more new mechanics, instead of returning ones. It’ll make the set feel fresher.
What do you think?