[pgkdan]

so will there be a special election in November 2020? Will Stacy Abrams weigh in and run in such an election?

No. Senators are replaced by the Governor of the state to complete the incumbents term. Kemp will probably make a good pick.

[vikingd00d]

>>No. Senators are replaced by the Governor of the state to complete the incumbents term. Kemp will probably make a good pick.

Incorrect. See http://ga.elaws.us/law/section21-2-542
The governor’s pick is only until the next November election (in this case 2020). The winner of that special election will hold office until 2022.