Didn't see it mentioned here.
Anyways with the new update the CP changes have gone into effect, nerfing the bajeezus out of Blissey, Snorlax, and Slaking, and boosting basically everything else.
The new "Sinnoh Stone" is now available. Currently being reported as only obtainable through Research Breakthrough (7 Research Stamps). It is used to evolve an previous Gen Pokemon into their newly introduced Sinnoh forms (Electrivire, Togekiss, Mismagius, Porygon-Z, etc).
From The Silph Road:
Gen 4 Evolutions:
Many Gen 4 evolutions are now obtainable in-game via evolving with a Sinnoh stone!
The Sinnoh Stone itself appears to be obtainable via the 7th Day Research Breakthrough - a nice way to make it obtainable for even those in rural areas (but not too common - unless another method arrives to obtain them, it will take months to evolve them all!)
So far, Sinnoh Stones have not been encountered in other ways - but we reached out to Niantic to see if they may become more common in the future. Liz from Niantic shared:
Evolution candy costs have been reduced for many species that have a Gen 4 evolution.
E.g. Rhyhorn, Togepi, Duskull, Porygon: 50 -> 25
Species now evolvable:
Species NOT yet evolvable: