It is doubtful if a 64 bit will be leaked with the 7260 build. The next chance will be with build: 6.1.7261.0.win7_rtm.090615-1900 - RTM branch build or indeed later . The waves or wavelets will start to come ashore from MS next week.
People say 7261 should leak x64 only. Much the same way 7230 and 31 did. I feel like I am out of date build wise I am only running 7229
Actually the only leaks that have been x64 only are 6936 and 7232. Only x86 exclusive leak(no x64) so far is the new 7260.