Details and model numbers of the SoCs were spotted by spotted by CPU World in a Product Change Notification.
It looks like the new processors will have increased burst frequency for better CPU and GPU performance.
Celeron and Pentium N3xxx SoCs are based on C core stepping, and it seems that Intel is replacing this with D-stepping. The chips will have the numbers N3060, N3160 and N3710. The integrated graphics unit will be rebranded to HD Graphics 405 on the Pentiums, and to HD Graphics 400 on the Celerons.
D-stepping chip samples will appear in a couple of weeks with the first production chips shipped on January 15, 2016.
The embedded N3000 will be refreshed too, although details on that are unavailable.
Chipzilla is planning to release new mobile and desktop models. The desktop SoCs will have a performance boost and a rebranded GPU. The TDP increased from 6 Watt to 6.5 Watt, and they will have the J3060, J3160 and J3710 product numbers.
The desktop Celeron J3060, J3160 and Pentium J3710 models are available at the end of November for samples, and mid-January of 2016 for production parts.