I'd wait for some reviews. Manfrotto and Gitzo are the same company. Some time back, Manfrotto announced the release of their new Top Lock Quick Release System which is, "Compatible with Arca-style quick release plates and systems.
" What they failed to mention is that while the Manfrotto plates for that system do work in everyone else's AS-type clamps, Manfrotto managed to make their 'Arca-compatible' clamp proprietary - it cannot be used with other manufacturers' plates (see this link
for details and pics). That means no RRS/Kirk L-brackets, no Wimberley/RRS/Kirk lens plates, no connecting your Blackrapid strap with a small Kirk/RRS clamp, etc., and you're stuck buying Manfrotto's Q6 plates for everything.
Hopefully Gitzo does it right, and anyone's plates and L-brackets work properly with their new clamp design.