these are still in the development stage. Just wait & see. Personally I would like to see the following:

--Core stage with 2 H2O2 engine @ 220 ton each

--4 Kerosene/O2 boosters@ 500 ton each

-- H2O2 2nd & 3rd stages

---lift off Wt @ 1900 ton

--equivalent LEO payload close to 100 ton...suffice manned lunar mission