Oppo launched the K12x in August of last year, and it's now working on its aptly named successor, the K13x. This has already appeared in the Google Play Supported Devices database, and it's been certified for sale in India by BIS.
Hence, it might actually launch sooner in the year than its predecessor, we assume. The K13x will join the K13 which was unveiled last month. Unfortunately, no specs of the K13x have been leaked so far, but since its release is nearing, we're likely to hear more about it soon.
Oppo K13
For reference, note that the K12x came with a 6.67-inch LCD screen with 120 Hz refresh rate and 1,000-nit peak brightness, the Dimensity 6300 SoC, 6/8GB of RAM, 128/256GB of storage, a 32 MP main camera, an 8 MP selfie snapper, and a 5,100 mAh battery with support for 45W wired charging.