I posted a preview (includes what is expected and priors) here

Note the data is due at 2330 GMT, 20 minutes prior to when we normally get Japanese data

Via Nomura:

  • We expect the December all Japan core CPI (ex-fresh food) to rise 1.0% y-o-y, 0.1pp stronger than the November reading.
  • We expect the December all-Japan core core CPI (all items ex energy and food, except alcoholic beverages) to rise 0.3%, up 0.2pp from November.
  • We think prices of food and a broad range of consumer goods contributed to higher inflation.
  • We expect the so-called BOJ version of the all-Japan core core CPI (all items ex energy and fresh food) to rise 0.5% y-o-y, a 0.2pp improvement from November.
  • We forecast the January Tokyo core CPI to rise 0.8% y-o-y, unchanged from December.
  • As the boost from energy prices weakens, we look for inflation to temporarily stall.
  • We expect January Tokyo core core CPI to rise 0.3%, a 0.1pp improvement from December, and the BOJ version of January Tokyo core core CPI to rise 0.4%, unchanged from December.

Just from that note, a couple of explainers:

  • Japan 'core' inflation is not the same as the core measure from, for example, the US. The Japan 'core-core' is closest to US core inflation
  • The BOJ version of inflation Nomura refers to is pretty much exactly what it says - its the it's the BOJ's own measure of (core core) inflation and is issued separately from this data much later today.

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And, a quickie few comments via Dai-ichi Life - they are not looking for higher inflation today nor in the next few months

  • We expect the core CPI index will stay around the same level in the following few months
  • Oil prices and an annual wage negotiations in spring will be closely watched for the outlook for consumer information