Some questions abount hard fork in 2019

I heared that there will be a hard fork in Oct 2019 and Blockstack blockchain will upgrade to version 2. Is it really?
Currently, i only found related development information about blockstack version 2 on []. But i could’t find blockstack.js sdk that is compatible for v2.So that i don’t know how to develop with blockstack v2 currently.
Please help me! thx!

No. The hard fork in 2019 will instantiate the Reg A tokens. The hard fork of 2020 will activate Stacks v2 (and will occur sometime late in Q1).

Thank you very much!
But I dont know what is the Reg A tokens.
Can you give me some materials about Reg A tokens or 2019 fork hard, such as a link or a doc?