The team gave the contentious recommendation to use only Guesser markets in the interim. The intention is to reduce impact on users between the cutoff period (September 15) and v2 launch. Guesser can ensure their markets meet this criteria and use their supply of REP to speed up market finalisation. Community members are unhappy with the foundation's push towards a specific interface.
MCD will not be a blocker. A secondary consideration for v2 launch delay is whether multi-collateral Dai will be "ready and sufficiently vetted". The team announced on Discord that MCD will not be a blocker to v2 launch. If MCD is not ready, the product will exclusively use ETH.
Guesser announced DeFi markets yesterday. The weekly markets will track total value locked in DeFi according to Defipulse. The first iteration has generated about 16 ETH in interest so far.