Amazon Go is the first of 3 or more new Amazon food store formats, reports say

Check out Amazon's latest concept: A store without lines or registers

Amazon's new Amazon Go store is one of at least three brick-and-mortar food formats being explored by the online retailer, sources told The Wall Street Journal on Monday.

Earlier Monday, Amazon announced an employee pilot program of Amazon Go, a high-tech Seattle convenience store that relies on an app and computer vision instead of traditional registers. It will open to the public early next year, Amazon said.

But The Wall Street Journal's sources said Amazon is also considering at least two types of bigger stores, including a store with curbside pick-up and a drive-through option. At least one drive-through location is slated to open in the next few weeks, the Journal said, citing people close to the situation, while a combination in-store and curbside pick-up format may be planned for late next year.

Amazon declined to comment on the report to CNBC on Monday, citing a policy against commenting on speculation.

But on Wednesday, Amazon said in an email to CNBC: "We have no plans to open 2,000 of anything. Not even close."

The Journal's report likely ties Amazon Go to a pilot program first reported by Business Insider. BI reported earlier this year that Amazon would experiment with a 20-store pilot program, including 10 "click-and-collect" drive-up grocery stores and 10 stores where consumers go inside to shop. Ultimately, Amazon may aim for 2,000 grocery stores across the U.S. over the next decade, BI reported.

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Editor's note — This story was updated Dec. 8 to include Amazon denial of plans for 2,000 stores.