This isn't a surprise really, but in a email I just got from Codemasters they said that LMA Manager 2006 is being dropped, and instead they plan to focus all their intentions on LMA Manager 2007.

"And if you're wondering where LMA Manager 2006 for Xbox360 and PC-DVD is then let me explain: We considered long and hard and after chatting with the fans we felt it would be better to be released at the start of the season rather than the end, so it's going to be part of the bigger and better LMA Manager 2007 launch instead, alongside an updated PS2 version. And, importantly, it's coming in late September!"