The X7000 is the Australian name for the 7000... the first autofocus SLR. Is that the one you mean?
The AF lenses for the 7000 will work on the new Sony DSLRs.
Old Sigma lenses may be incompatible (Sigma didn't license the technology but reverse engineered for the Minolta A-mount. Some of their older lenses are now incompatible) though if you have any of these, Sigma may be able to re-chip them for you.
'Quid quid latine dictum sit, altum videtur'