Hello, so what happens if I don't remove my TRK from online exchange before fork?
You don't get free HYP, that's all. Remember we are not affiliated with TRK dev. TRK will continue to its own life.
Can I download new HYP wallet and transfer TRK wallet.dat file on Monday to new wallet? Lets say I have 1000 TRK so on Monday I would have 2000 HYP? Thanks.
Depends on how long will the grace period be (grace period: time between availability of the HYP wallet and actual forking). I can't tell you the time now. It won't be weeks, that's for sure.
After the transition, you won't have 2000 HYP. You will have 1000 TRK and 1000 HYP. You will keep the same address so you won't be able to multiply the 1000 TRK in several time 1000 HYP. It also means that you will have two different coins with exactly the same address - which is not a problem since you won't be using the same daemon once the hardfork is done. Much like having two machines called 192.168.0.5 is no problem in two different companies.