The Xbox 360 version of Guitar Hero II will be arriving in the States on April 3, with retailers - like this one - pointing to a slightly later release in Europe on April 6.
Considering the 6th is Good Friday, most people might not be able to get their hands on the 360 axe until April 10 when the shops re-open.
The Xbox 360 version of the game sports an entirely re-designed X-Plorer axe and there's also the suggestion of it having the most download content for any game on the console.
We've left an enquiry with the nice chaps at Activison and we'll let you know if they shed some official light on the UK date.