Do we lose our coins if we do not update wallet from 1.0.0.2 to 2.0.0.1 before block 110.000?
You should not. It is the same protocol version 70002 and everything will be compatible.
It is highly suggested you update however.
I would not send/receive payments on 1.0.0.2 or you may lose coins. Only use 2.0.0.1 for transaction purposes.