Sigma announced the pricing of their new series of full-frame mirrorless prime Art lenses for Sony E-mount - the price is the same as the DSLR versions.
The "new" lenses are basically the existing DSLR Art lenses with an added/built-in Sigma MC-11 adapter which is why the lenses are so "long":
The pricing for the new 70mm and 105mm lenses was not announced:
Additional information:
https://photorumors.com/2018/03/01/the-new-sigma-lenses-at-the-2018-cp-show/
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