Big thanks to the Bittrex Support staff, we now have a confirmed date for our upcoming $GEO swap. 
https://support.bittrex.com/hc/en-us/articles/115003177652
https://support.bittrex.com/hc/en-us/articles/115003177652
i have almost 1000 geocoin available in bittrex. do i have to do anything or i will get another 1000 geocoin in 26.01.2018 ? tell me plz.
Yes you will get exactly the same amount 1000 Geocoin! but from 26th it will be a ERC20 token on the Ubiq blockchain.
You will need a UBIQ wallet after 26th December if you want to withdraw $GEO - https://ubiqsmart.com/
mean: bittex automatic swap my geo on bittrex with get another geocoin, and after 26.01.2018, i have new 1000 geo on bittrex and can exchange it?