Nick,
From my understanding these guns are no better or worse than the MKII. They are just a little different.
They added a loaded chamber indicator, a grip mounted magizine release and tapered the bolt ears for a more ergonomic feel. I think these are improvements except for the loaded chamber indicator. It looks to me like those things might catch debree or get gummed up somehow. They are also installing a fluted barrel. The fluted barrel does nothing more than reduce a little weight so the gun will not feel so front heavy.
So accuracy wise and mechanical function wise they should be the same.
It's up to you to decide if you like the additional features or not. I'm sure if you looked around you could find a last years modle still NIB somewhere.
Take Care,
Scott