We will launch mainnet after the Zcash final release, which should happen within 2 weeks after ICO. The certainty of this timeline will be double-checked after we move closer to the ICO. For example,  Zcash testnet beta should begin tomorrow!

This is a huge project, and with any huge projects delays are possible. Delays could come from our end or from Zcash. However, jl777 is confident that the Zcash team is doing great job and will stay in schedule.  At this point, there are no reasons to suspect any delays.