This assertion is true. The news was announced by Google in a blog post published that day. According to Google, Jennifer Daniel, the company's creative director for emoji, "submitted paperwork for Unicode to consider the addition of the multi-skin toned handshake" in November 2019. "The proposal detailed how to create 25 possible combinations of different skin tones shaking hands," Google said:
The Unicode Consortium oversees a standardized system, Unicode, that assigns "a unique number for every character, no matter what the platform, program, or language is" and accepts submissions from the public for new emojis. According to Google, Unicode accepted the handshake emoji proposal, and it will be included in the Unicode Consortium's next emoji update, expected to be released sometime in 2022.
Because the news has been confirmed by Google and Unicode, we rate the claim that this new multi-toned handshake emoji is on its way as "True."