It would have been very easy for Jessica to say there's only going to be the Limited Edition that we've already seen, so this does seem to suggest there may be something more they've still to announce.
We know there's no Legendary version of the game, but I've previously speculated that we could see a Legendary Xbox 360 console. With previous Halo releases where there's been a Legendary game and Special Edition console, many fans have had to choose one or the other and end up feeling as though they're not getting the "complete" package. So it would make sense for them to forego the Legendary game in favour of a really special version of the Xbox 360 hardware.
Sad Diego Comic-Con in a couple of weeks (12-15th July) would be a logical place to announce a new console - it's the right audience at any rate - so hopefully we won't have too long to wait.
- Cowboy Out.
Big thanks to Quentin for the tip!