This week's Xbox Live Arcade upload should have been the 1981 arcade classic Scramble, but it has been delayed until next week due to "Final testing and certification issues".
It will now go up on XBLA on September 13 and, in its stead, Microsoft is releasing a somewhat less enticing PGR3-themed deck for Uno. It's a bit of a shame that we'll have to wait an extra week for Scramble, though: after all, you'd imagine that all the bugs would have been fixed in the mere 25 years since it launched...