More or less... Looks like the Main Enhancements over the Cancelled XM8 are that it can accept STANAG Compatible Magazines - like the PMAG30 here shown through Pimp My Gun, in place of the TMAG30 appeared in the first Trailer and some Images - and the Integrated Accessory Rails - unlike the XM8, which featured some PCAP Holes for mounting Rail Pieces - . About Performances, we'll have to wait only another month!
TMK i heard it got canned also because the final product was so far from the original blue print that won the contracts with the DoA, they are having to scrap it entirely. Something about it being unfair to the other arms companies because the gun that was being made wasn't the one that was originally awarded the contract. meaning it'll have to re-square off with new and improved competition. assuming funding isn't cut.