The NPD sales numbers have gone out for January 2014, and PlayStation announced that the PS4 is "the #1 selling game console in the US in January, still #1 worldwide." The PlayStation Australia website also chimed in writing, "The PS4 system moved into the top spot for next generation console sales last month."
The NPD doesn't make specific sales numbers available for hardware, but according to the official PlayStation blog, VP of PlayStation marketing John Koller said, "PS4 was #1 in sales for next-gen consoles in January, nearly doubling the nearest next-gen competitor."
Surprisingly, the next-gen console also over took the former frontrunner, Nintendo's 3DS. In their report, the NPD confirmed, "PS4 led overall hardware sales this month, followed by the Xbox One." No sales number were made available for Nintendo's Wii U.
However, Microsoft reported in a press release that the Xbox One and Xbox 360 combined "sold the most games across all console platforms."