The ICO starts Now! The rate for the first stage is 1EOS = 3000 EXP https://eosex.com/#/exchange/EXPEOS 
Is there any minimum amt for investment in ICO?
Its say 5EOS to 5000 EOS so 5EOS is the minimum to which 1EOS = 3000EXP. ICO started today.
ICO has already started but many people are not showing interest because it seems team is not showing their credibility in the market. They need to do different marketing for promotional activity in order to prove themselves.