We're starting to get spoilers from the new set. None of them really look super impressive yet, certainly not for Vintage, but the mechanics seem very promising.
First, we have Cycling making a triumphant return. I think it's only by accident we don't really use many (any) Cycling cards in Vintage. Practically the only one I can think of is the 2U Hurkyl's, (Rebuild?) and that has not been seen for an age. Still, it's a good mechanic and adds flexibility to cards. I am not holding my breath that this mechanic gets pushed too much, but I'm hopeful.
Next, we Embalm and Exert. Both are explicitly creature-oriented, which is usually a bad sign. Exert is really boring; the creature has to attack, and then in return for not untapping next turn, it does A Thing. Certainly they could print a powerful enough Exert effect to see play, but as a mechanic, this seems dull as rocks. We do not typically enjoy creature mechanics which require attacking (apologies to Scab-Clan Berserker).
Embalm seems more interesting in a vaccuum . Basically it's an activated ability that is used from the graveyard. When you Embalm, you exile the creature from your yard and put a token copy of it into play except that it's a white Zombie instead of its old color and in addition to its old type. Seems... awfully complicated for an iconic ability in the set. Yuck.
Again, I'd be shocked if they put the power level of Emblam cards high enough to make a splash in Dredge, but you never know. One thing in particular makes it very important to keep an eye on utility creatures with Embalm - the creature itself does not come out of the graveyard. Hence, Containment Priest and Grafdiggers' Cage don't do squat against Embalm. If we can just get an Embalm creature that pings for 2 when it enters, or kills an artifact or something, then I think we'll have to see people reaching into the back of the box for Yxilid Jailer again. About time the Mistress of S&M showed up again!